US Patent Class 246
RAILWAY SWITCHES AND SIGNALS
 Electronic File Wrappers |  Electronic Patent Documents |  Paper Patent Documents | Current as of: June, 1999
|  and Services |
| Electronic File Wrappers | Electronic Patent Documents | Paper Patent Documents | Current as of: June, 1999
| and Services |
| DF | CLASS NOTES | |
| 1 R | DF | MISCELLANEOUS |
| 1 C | DF | .~ Signals and indicators |
| 2 R | DF | TRAIN DISPATCHING |
| 3 | DF | .~ Central signal control |
| 4 | DF | .~.~ Cab signal or train control |
| 5 | DF | .~.~ Selective |
| 6 | DF | .~ Train-order cab signal or train control |
| 7 | DF | .~ Train telegraphy or telephony |
| 8 | DF | .~.~ Inductive |
| 9 | DF | .~.~ Continuous contacts |
| 10 | DF | .~.~.~ Traction rail return |
| 11 | DF | .~.~.~.~ Multiple contact |
| 12 | DF | .~.~.~ Instruments in series |
| 13 | DF | .~.~ Emergency signal stations |
| 14 | DF | .~ Station, block, or train-order signals |
| 15 | DF | .~.~ Safety systems |
| 16 | DF | .~.~.~ Holders |
| 17 | DF | .~.~ Rotary, vertical axis |
| 18 | DF | .~.~ Double semaphore |
| 2 E | DF | .~ Orientation |
| 2 F | DF | .~ Frequency |
| 2 S | DF | .~ Spacing |
| 19 | DF | STAFF AND TABLET SYSTEMS |
| 20 | DF | BLOCK-SIGNAL SYSTEMS |
| 21 | DF | .~ Semi-automatic |
| 22 | DF | .~.~ Electromanual |
| 23 | DF | .~.~.~ Cab signal or train control |
| 24 | DF | .~.~.~ Circuit controllers |
| 25 | DF | .~.~.~ Lock and block |
| 26 | DF | .~.~.~.~ Track-circuit control |
| 27 | DF | .~ Automatic |
| 28 R | DF | .~.~ Electric |
| 29 R | DF | .~.~.~ Radiant energy |
| 30 | DF | .~.~.~.~ Hertzian wave |
| 29 A | DF | .~.~.~.~ Electronic gaseous ionization devices |
| 31 | DF | .~.~.~ Propulsion-current control |
| 32 | DF | .~.~.~.~ Current consumption |
| 33 | DF | .~.~.~ Single track |
| 34 R | DF | .~.~.~ Varying-current track circuit |
| 35 | DF | .~.~.~.~ Propulsion-current return |
| 36 | DF | .~.~.~.~.~ Double rail |
| 37 | DF | .~.~.~.~.~.~ Impedance bond |
| 38 | DF | .~.~.~.~ Wireless distant control |
| 39 | DF | .~.~.~.~ Line-wire distant control |
| 40 | DF | .~.~.~.~ Single block |
| 34 A | DF | .~.~.~.~ Approach control |
| 34 B | DF | .~.~.~.~ Coded circuits |
| 34 C | DF | .~.~.~.~ Insulation breakdown |
| 34 D | DF | .~.~.~.~ Saturable reactors |
| 34 CT | DF | .~.~.~.~ Continuous track |
| 41 | DF | .~.~.~ Direct current, normally closed, track circuit |
| 42 | DF | .~.~.~.~ Propulsion-current return |
| 43 | DF | .~.~.~.~.~ Varying |
| 44 | DF | .~.~.~.~ Wireless distant control |
| 45 | DF | .~.~.~.~.~ Current reversal |
| 46 | DF | .~.~.~.~ Line-wire distant control |
| 47 | DF | .~.~.~.~.~ Cab signal or train control |
| 48 | DF | .~.~.~.~.~.~ Bridged insulated rail joint |
| 49 | DF | .~.~.~.~.~.~ Intermittent contact |
| 50 | DF | .~.~.~.~.~ Current characteristic |
| 51 | DF | .~.~.~.~.~ Overlapped blocks |
| 52 | DF | .~.~.~.~.~ Home and distant |
| 53 | DF | .~.~.~.~.~ Three position |
| 54 | DF | .~.~.~.~ Single block |
| 55 | DF | .~.~.~.~.~ Cab signal or train control |
| 56 | DF | .~.~.~.~.~.~ Intermittent contact |
| 57 | DF | .~.~.~.~.~.~ Bridged insulated rail joint |
| 58 | DF | .~.~.~ Direct-current, normally open, track circuit |
| 59 | DF | .~.~.~.~ Cab signal or train control |
| 60 | DF | .~.~.~.~ Distant-signal control |
| 61 | DF | .~.~.~ Superimposed propulsion current |
| 62 | DF | .~.~.~ Cab signal or train control |
| 63 R | DF | .~.~.~.~ Inductive |
| 63 C | DF | .~.~.~.~.~ Continuous |
| 63 A | DF | .~.~.~.~.~ Intermittent |
| 64 | DF | .~.~.~.~ Train-carried current supply |
| 65 | DF | .~.~.~.~.~ Multiple continuous contacts |
| 66 | DF | .~.~.~.~.~.~ Sectional |
| 67 | DF | .~.~.~.~.~ Single continuous contact |
| 68 | DF | .~.~.~.~.~.~ Sectional |
| 69 | DF | .~.~.~.~.~ Intermittent contact |
| 70 | DF | .~.~.~.~.~.~ Rail circuit |
| 71 | DF | .~.~.~.~.~.~ Rail return |
| 72 | DF | .~.~.~.~ Propulsion-current signaling |
| 73 | DF | .~.~.~.~ Continuous contact |
| 74 | DF | .~.~.~.~ Intermittent contact |
| 75 | DF | .~.~.~.~ Bridged insulated rail joint |
| 76 | DF | .~.~.~.~ Track trip |
| 77 | DF | .~.~.~ Counting in and out |
| 78 | DF | .~.~.~.~ Ratchet wheel |
| 79 | DF | .~.~.~.~.~ Double opposed pawls |
| 80 | DF | .~.~.~.~.~.~ Parallel teeth |
| 81 | DF | .~.~.~ Propulsion-current signaling |
| 82 | DF | .~.~.~.~ Rotary controller |
| 83 | DF | .~.~.~.~ Car-actuated controller |
| 84 | DF | .~.~.~.~.~ Trolley or plow |
| 85 | DF | .~.~.~.~ Intermittent contact |
| 86 | DF | .~.~.~ Train-carried current supply |
| 87 | DF | .~.~.~ Line-current supply |
| 88 | DF | .~.~.~.~ Intermediate signal |
| 89 | DF | .~.~.~.~ Short sectional rail closure |
| 90 | DF | .~.~.~.~ Car-actuated controller |
| 91 | DF | .~.~.~.~.~ Relay |
| 92 | DF | .~.~.~.~ Intermittent contact |
| 28 C | DF | .~.~.~ Ballast leakage |
| 28 E | DF | .~.~.~ Economy use of line wire |
| 28 F | DF | .~.~.~ Checking circuits |
| 28 G | DF | .~.~.~ Light-out |
| 28 H | DF | .~.~.~ Intermittent light |
| 28 K | DF | .~.~.~ Transformer |
| 93 | DF | .~.~ Combined fluid pessure and electric |
| 94 | DF | .~.~.~ Cab signal or train control |
| 95 | DF | .~.~.~ Track-circuit control |
| 96 | DF | .~.~ Electromechanical |
| 97 | DF | .~.~.~ Cab signal or train control |
| 98 | DF | .~.~.~ Track-circuit control |
| 99 | DF | .~.~.~ Clockwork |
| 100 | DF | .~.~ Fluid pressure |
| 101 | DF | .~.~.~ Cab signal or train control |
| 102 | DF | .~.~ Mechanical |
| 103 | DF | .~.~.~ Cab signal or train control |
| 104 | DF | .~ Manual |
| 105 | DF | .~.~ Electric |
| 106 | DF | .~.~.~ Lock and block |
| 107 | DF | .~ Recorders |
| 108 | DF | TIME INDICATION, AUTOMATIC |
| 109 | DF | .~ Flow retarded |
| 110 | DF | .~ Time limit expired |
| 111 | DF | GRADE-CROSSING TRACK PROTECTION |
| 112 | DF | .~ Semi-automatic |
| 113 | DF | .~ Automatic |
| 114 R | DF | .~.~ Electric |
| 115 | DF | .~.~.~ Cab signal or train control |
| 114 A | DF | .~.~.~ Cross-over protection |
| 116 | DF | .~.~ Fluid pressure |
| 117 | DF | .~ Cab signal or train control |
| 118 | DF | DRAWBRIDGE PROTECTION |
| 119 | DF | .~ Cab signal or train control |
| 120 | DF | ROADWAY-DEFECT PROTECTION |
| 121 | DF | .~ Electric |
| 122 R | DF | TRAIN-POSITION INDICATION |
| 123 | DF | .~ Automatic time recording |
| 124 | DF | .~ Train annunciators or indicators |
| 122 A | DF | .~ Miniature model |
| 125 | DF | ELECTRIC AUTOMATIC HIGHWAY SIGNALS, MINE DOORS, AND GATES |
| 126 | DF | .~ Car-actuated controller |
| 127 | DF | .~.~ Gates and doors |
| 128 | DF | .~ Normally open track circuit |
| 129 | DF | .~.~ Short sectional rail closure |
| 130 | DF | .~ Normally closed track circuit |
| 131 | DF | INTERLOCKING |
| 132 | DF | .~ Electric actuation |
| 133 | DF | .~.~ Electric locking |
| 134 | DF | .~.~.~ Route locking |
| 135 | DF | .~.~.~ Return-release indication |
| 136 | DF | .~.~ Mechanical locking |
| 137 | DF | .~.~.~ Return-release indication |
| 138 | DF | .~.~.~.~ Locked slide |
| 139 | DF | .~ Fluid-pressure actuation |
| 140 | DF | .~.~ Electrically controlled valve |
| 141 | DF | .~.~.~ Return-release indication |
| 142 | DF | .~.~ Return-release indication |
| 143 | DF | .~ Manual actuation |
| * | DD | .~.~ Switch stands |
| 144 | DF | .~.~.~ Signal-actuating |
| 145 | DF | .~.~.~.~ Double lever |
| 146 | DF | .~.~ Electrical locking |
| 147 | DF | .~.~ Mechanical locking |
| 148 | DF | .~.~.~ Preliminary |
| 149 | DF | .~.~.~.~ Tappets |
| 150 | DF | .~.~.~ Tappets |
| 151 | DF | .~.~.~ Detector bars |
| 152 | DF | .~.~.~ Compensators |
| 153 | DF | .~.~.~.~ Counterweight |
| 154 | DF | .~.~.~.~.~ Intermittent grip |
| 155 | DF | .~.~.~ Rod-saving devices |
| 156 | DF | .~.~.~.~ Selectors |
| 157 | DF | .~.~.~.~.~ Electric |
| 158 | DF | .~.~.~.~ Switch and lock movements |
| 159 | DF | .~ Detached locking, check locking, or key control |
| 160 | DF | .~ Approach locking |
| 161 | DF | .~ Retarded-release mechanism |
| 162 | DF | .~ Switch or signal indicators |
| 163 | DF | .~ Derails |
| 164 | DF | SLOTTING AND CONTROL |
| 165 | DF | .~ Electric |
| 166 | DF | PILOT OR SIGNAL CARS |
| 166.1 | DF | SIGNALLING BETWEEN OCCUPANTS OF A TRAIN |
| 167 R | DF | CAB SIGNAL OR TRAIN CONTROL |
| 168 | DF | .~ Train parting |
| 168.1 | DF | .~ Wheel slip |
| 169 R | DF | .~ Train defect |
| 169 A | DF | .~.~ Hot bearing detectors |
| 169 D | DF | .~.~ Radiant energy type |
| 169 S | DF | .~.~ Sound detectors |
| 170 | DF | .~ Derailment |
| 171 | DF | .~.~ Contact trips |
| 172 | DF | .~.~.~ Frangible |
| 173 | DF | .~.~ Inertia trips |
| 174 | DF | .~ Highway or station, automatic |
| 175 | DF | .~.~ Code signal |
| 176 | DF | .~ Switch signals |
| 177 | DF | .~ Block entrance initiated |
| 178 | DF | .~.~ Electric or magnetic control |
| 179 | DF | .~.~.~ Bridged insulated rail joint |
| 180 | DF | .~.~.~ Cab-circuit controller |
| 181 | DF | .~.~.~ Mechanical actuation |
| 182 R | DF | .~ Speed-control systems |
| 182 A | DF | .~.~ Track brake speed control |
| 182 B | DF | .~.~ Automatic vehicle-carried braking |
| 182 BH | DF | .~.~ Humped, unpowered cars |
| 182 C | DF | .~.~ Automatic vehicle-carried speed comparison circuits |
| 182 AA | DF | .~.~ Yard-switching, dispersed |
| 182 AB | DF | .~.~ Yard-switching, centralized |
| 183 | DF | .~ Manual-control systems |
| 184 | DF | .~ Service stop |
| 185 | DF | .~ Recording devices |
| 186 | DF | .~ Motive-power control |
| 187 R | DF | .~.~ Electric |
| 187 A | DF | .~.~.~ Remote control |
| 187 B | DF | .~.~.~ Non-mechanical control of vehicles from wayside |
| 187 C | DF | .~.~.~ Control of vehicle from leading vehicle |
| 188 | DF | .~.~ Fluid-pressure-actuated throttle |
| 189 | DF | .~ Engineer's brake-valve actuation |
| 190 | DF | .~ Train-pipe-valve structure |
| 191 | DF | .~ Visual cab signals |
| 192 R | DF | .~ Train mechanism |
| 193 | DF | .~.~ Electric or magnetic |
| 194 | DF | .~.~.~ Inductive |
| 195 | DF | .~.~.~ Intermittent contact |
| 196 | DF | .~.~.~ Cab-circuit controller |
| 197 | DF | .~.~.~.~ Magnetically actuated |
| 198 | DF | .~.~ Single-direction actuation |
| 199 | DF | .~.~ Frangible |
| 200 R | DF | .~.~ Lever actuated |
| 200 A | DF | .~.~.~ Lever perpendicular inclined less than 45 degree |
| 200 B | DF | .~.~.~ Lever transverse relative to direction of travel |
| 192 A | DF | .~.~ Train-carried electric contact mechanism |
| 201 | DF | .~ Track trips |
| 202 | DF | .~.~ Electric or magnetic |
| 203 R | DF | .~.~ Pivoted |
| 203 A | DF | .~.~.~ Single vertical pivot on which track trip turns |
| 203 B | DF | .~.~.~ Single vertical pivot; strike rod transverse of track |
| 203 C | DF | .~.~.~ Single horizontal pivot on which track trip turns |
| 203 D | DF | .~.~.~ Single horizontal pivot; strike rod transverse of track |
| 203 E | DF | .~.~.~ Horizontal pivot, vertical rod, strike rod perpendicular |
| 204 | DF | .~.~ Vertical motion |
| 205 | DF | .~.~ Lateral motion |
| 206 | DF | .~.~ Fixed |
| 207 | DF | .~.~ Portable |
| 167 A | DF | .~ Train approach warning for work cars |
| 167 M | DF | .~ Magnetic rail |
| 167 D | DF | .~ Vehicle-vehicle distance measuring |
| 208 | DF | CAR-DISPLAYED CROSSING SIGNALS |
| 209 | DF | PASSENGERS' STATION SIGNALS |
| 210 | DF | TORPEDO MECHANISM |
| 211 | DF | .~ Electric |
| 212 | DF | .~ Magazine |
| 213 | DF | .~.~ Vertical |
| 214 | DF | .~.~ Rotary |
| 215 | DF | .~ Car attached |
| 216 | DF | .~ Hand placing devices |
| 217 | DF | AUDIBLE SWITCH AND SIGNAL INDICATORS |
| 218 | DF | ELECTRIC ACTUATION |
| 219 | DF | .~ Control circuits |
| 220 | DF | .~ Switch signals |
| 221 | DF | .~ Motor systems |
| 222 | DF | .~.~ Return-indication-current generation |
| 223 | DF | .~.~ Three-position signals |
| 224 | DF | .~.~ Home and distant signals |
| 225 | DF | .~.~ Reciprocating armature |
| 226 | DF | .~.~.~ Controller-actuated switches |
| 227 | DF | .~.~.~.~ Opposed magnets |
| 228 | DF | .~.~.~.~.~ Circuit changers |
| 229 | DF | .~.~.~.~.~ Tandem contacts |
| 230 | DF | .~.~.~.~ Alternate throw |
| 231 | DF | .~.~.~ Opposed magnets |
| 232 | DF | .~.~.~.~ Circuit changers |
| 233 | DF | .~.~.~.~ Tandem contacts, switches |
| 234 | DF | .~.~.~.~ Parallel contacts, switches |
| 235 | DF | .~.~.~.~.~ Circuit controller |
| 236 | DF | .~.~.~ Alternate throw |
| 237 | DF | .~.~.~ Fly-back |
| 238 | DF | .~.~.~.~ Latch or clutch release |
| 239 | DF | .~.~.~.~ Switches |
| 240 | DF | .~.~ Rotary armature |
| 241 | DF | .~.~.~ Opposed motors |
| 242 R | DF | .~.~.~ Circuit changers |
| 242 A | DF | .~.~.~.~ Overload release |
| 242 B | DF | .~.~.~.~ Dual selector circuit |
| 242 C | DF | .~.~.~.~.~ Remote lever, local selector |
| 243 | DF | .~.~.~ Fly-back |
| 244 | DF | .~.~.~.~ Latch or clutch release |
| 245 | DF | .~ Car-actuated generators |
| 246 | DF | .~ Car-actuated circuit controllers |
| 247 | DF | .~.~ Wheel or train counting |
| 248 | DF | .~.~ Retarded action |
| 249 | DF | .~.~ Electric or magnetic |
| 250 | DF | .~.~ Single-direction actuation |
| 251 | DF | .~.~ Vertically sprung rail |
| 252 | DF | .~.~ Trolley or plow actuated |
| 253 | DF | .~ Switch or signal actuated controllers |
| 254 | DF | .~ Trolley-completed circuits |
| 255 | DF | .~ Car-wheel-completed circuits |
| 256 | DF | .~ Relays |
| 257 | DF | FLUID-MOTOR ACTUATION |
| 258 | DF | .~ Electric control |
| 259 | DF | .~.~ Car-controlled switches |
| 260 | DF | .~ Signals |
| 261 | DF | .~ Gates |
| 262 | DF | MECHANICAL-MOTOR ACTUATION |
| 263 | DF | .~ Electric control |
| 264 | DF | POINT THROWERS |
| 265 | DF | .~ Magnetic |
| 266 | DF | .~ Modifier switch |
| 267 | DF | .~.~ Directing-grooves |
| 268 | DF | .~ Wedging wheel |
| 269 | DF | .~ Sliding shoe |
| 270 R | DF | VEHICLE-ENERGY ACTUATION |
| 271 | DF | .~ Fluid transmission |
| 272 | DF | .~.~ Gates |
| 273 | DF | .~ Continuous-rail crossings |
| 274 | DF | .~ Switch-connected frogs |
| 275 | DF | .~ Continuous-rail frogs |
| 276 | DF | .~.~ Spring rail |
| 277 | DF | .~ Automatic turnouts |
| * | DD | .~ Switch stands, automatic |
| 278 | DF | .~.~ Facing setting |
| 279 | DF | .~.~.~ Manual control |
| 280 | DF | .~.~.~ Resetting |
| 281 | DF | .~.~.~.~ Vehicle restrained |
| 282 | DF | .~.~.~ Trailing setting |
| 283 | DF | .~.~.~.~ Yielding rail |
| 284 | DF | .~.~ Trailing setting |
| 285 | DF | .~.~.~ Yielding rail |
| 286 | DF | .~.~.~.~ Spring-clutch |
| 287 | DF | .~.~.~.~.~ Coaxial spring |
| 288 | DF | .~.~.~.~ Counterweight |
| 289 | DF | .~.~.~.~ Frangible |
| 290 | DF | .~.~ Trailing fly-back |
| 291 | DF | .~.~.~ Spring actuated |
| 292 | DF | .~ Signals and gates, automatic |
| 293 | DF | .~.~ Highway crossing |
| 294 | DF | .~.~.~ Visual and audible |
| 295 | DF | .~.~.~ Audible |
| 296 | DF | .~.~.~.~ Bells, single stroke |
| 297 | DF | .~.~ Track mechanism |
| 298 | DF | .~.~.~ Single direction |
| 299 | DF | .~.~.~ Latch or clutch release |
| 300 | DF | .~.~.~.~ Electric |
| 301 | DF | .~.~.~.~ Longitudinal motion |
| 302 | DF | .~.~.~.~ Vertical motion |
| 303 | DF | .~.~.~ Longitudinal spiral cam |
| 304 | DF | .~.~.~ Vehicle-restrained gates and doors |
| 305 | DF | .~.~.~.~ Parallel swing |
| 306 | DF | .~.~.~.~ Longitudinal motion |
| 307 | DF | .~.~.~.~ Vertical motion |
| 308 | DF | .~.~.~.~.~ Swinging |
| 309 | DF | .~.~.~.~.~.~ Yielding rail |
| 310 | DF | .~.~.~ Parallel swing |
| 311 | DF | .~.~.~ Longitudinal motion |
| 312 | DF | .~.~.~.~ Rectilinear |
| 313 | DF | .~.~.~ Vertical motion |
| 314 | DF | .~ Switches, automatic |
| 315 | DF | .~.~ Resetting, vehicle restrained |
| 316 | DF | .~.~ Wheel resetting |
| 317 | DF | .~.~ Facing setting |
| 318 | DF | .~.~ Trailing setting |
| 319 | DF | .~.~ Trailing fly-back |
| 320 R | DF | .~.~.~ Spiral spring |
| 321 | DF | .~.~.~.~ Tie or connecting rod |
| 320 A | DF | .~.~.~.~ Dash pot |
| 322 | DF | .~.~ Track mechanism |
| 323 | DF | .~.~.~ Selective |
| 324 | DF | .~.~.~ Latch or clutch release |
| 325 | DF | .~.~.~.~ Electric control |
| 326 | DF | .~.~.~ Electric control |
| 327 | DF | .~.~.~ Alternate throw |
| 328 | DF | .~.~.~.~ Tappet wheel |
| 329 | DF | .~.~.~ Three and multiple throw |
| 330 | DF | .~.~.~ Traffic protected |
| 331 | DF | .~.~.~ Rotary longitudinal connecting shaft |
| 332 | DF | .~.~.~ Cable and pulley connection |
| 333 | DF | .~.~.~ Longitudinal sprial cam |
| 334 | DF | .~.~.~ Rack and pinion |
| 335 | DF | .~.~.~ Bow spring |
| 336 | DF | .~.~.~ Longitudinal motion |
| 337 | DF | .~.~.~.~ Train-trip elevation |
| 338 | DF | .~.~.~.~ Track-mechanism depression |
| 339 | DF | .~.~.~.~ Perpendicular swing |
| 340 | DF | .~.~.~.~.~ Double |
| 341 | DF | .~.~.~.~ Horizontal swing |
| 342 | DF | .~.~.~.~.~ Double acting |
| 343 | DF | .~.~.~.~.~ Double |
| 344 | DF | .~.~.~ Transverse motion |
| 345 | DF | .~.~.~.~ Duplex lever |
| 346 | DF | .~.~.~.~ Swinging |
| 347 | DF | .~.~.~.~.~ Double acting |
| 348 | DF | .~.~.~.~.~.~ Guiding tail |
| 349 | DF | .~.~.~.~.~ Double |
| 350 | DF | .~.~.~.~ Double acting |
| 351 | DF | .~.~.~.~ Vertical motion |
| 352 | DF | .~.~.~.~.~ Duplex lever |
| 353 | DF | .~.~.~.~.~ Swinging |
| 354 | DF | .~.~.~.~.~.~ Double acting |
| 355 | DF | .~.~.~.~.~.~ Double |
| 356 | DF | .~.~.~.~.~ Double |
| 357 | DF | .~.~.~.~.~.~ Transverse lever connection |
| 358 | DF | .~ Switch locks, automatic |
| 359 | DF | .~ Train trips |
| 360 | DF | .~.~ Electric or magnetic |
| 361 | DF | .~.~ Fluid pressure |
| 362 | DF | .~.~ Resilient |
| 363 | DF | .~.~ Hooks |
| 364 | DF | .~.~ Racks or friction bars |
| 365 | DF | .~.~ Pivoted |
| 366 | DF | .~.~.~ Wheel |
| 367 | DF | .~.~.~ Rod |
| 368 | DF | .~.~ Vertical motion |
| 369 | DF | .~.~.~ Wheel |
| 370 | DF | .~.~.~ Rod |
| 371 | DF | .~.~ Lateral motion |
| 372 | DF | .~.~.~ Wheel |
| 373 | DF | .~.~.~ Rod |
| 270 A | DF | .~ Automatic switch actuation from or by vehicle |
| 374 | DF | SAFETY SIDINGS |
| 375 | DF | CONTINUOUS-RAIL CROSSING |
| 376 | DF | .~ Overlapped main |
| 377 | DF | .~ Pivoted rail |
| 378 | DF | .~ Rotary block |
| 379 | DF | .~ Movable point |
| 380 | DF | .~ Sliding rail |
| 381 | DF | .~.~ Longitudinal |
| 382 | DF | SWITCH-CONNECTED FROGS |
| 383 | DF | .~ Overlapped main |
| 384 | DF | .~.~ Double rail |
| 385 | DF | .~ Swinging tongue |
| 386 | DF | .~.~ Stub end |
| 387 | DF | .~ End-pivoted rail |
| 388 | DF | .~ Center-pivoted rail |
| 389 | DF | .~ Swinging rail |
| 390 | DF | .~.~ Opposed swing |
| 391 | DF | .~.~ Wing |
| 392 | DF | .~ Transversely sliding rail |
| 393 | DF | SWITCH STANDS |
| 394 | DF | .~ Cab signal or train control |
| 395 | DF | .~ Resetting |
| 396 | DF | .~.~ Latch release, automatic |
| 397 | DF | .~.~ Hand restrained |
| 398 | DF | .~.~ Vehicle restrained |
| 399 | DF | .~.~ Detention devices |
| 400 | DF | .~.~ Key retaining |
| 401 | DF | .~ Rail lock and position indication |
| 402 | DF | .~.~ Transverse rotary locking shaft |
| 403 | DF | .~ Three and multiple throw |
| 404 | DF | .~ Adjustable throw |
| 405 | DF | .~ Spiral-cam actuated |
| 406 | DF | .~ Gear actuated |
| 407 | DF | .~ Structural types |
| 408 | DF | .~.~ Depressed mechanism |
| 409 | DF | .~.~ High semaphore stands |
| 410 | DF | .~.~ Vertical lever |
| 411 | DF | .~.~.~ Ground stands |
| 412 | DF | .~.~ Horizontal lever |
| 413 | DF | .~.~.~ Drop arm |
| 414 | DF | .~.~.~.~ Automatic key-lock |
| 415 R | DF | SWITCHES |
| 416 | DF | .~ Slip |
| 417 | DF | .~ Frog obviating |
| 418 | DF | .~.~ Single ral |
| 419 | DF | .~ Conduit, third rail or trolley |
| 420 | DF | .~ Nonderailing, trailing |
| 421 | DF | .~.~ Risers |
| 422 | DF | .~.~ Moving guard rail |
| 423 | DF | .~ Facing, rerailing |
| 424 | DF | .~ Facing, selective |
| 425 | DF | .~.~ Side draft |
| 426 | DF | .~.~ Modified wheel |
| 427 | DF | .~ Stationary turnout |
| 428 | DF | .~ Snow protected |
| 429 | DF | .~ Overlap |
| 430 | DF | .~ Sliding |
| 431 | DF | .~ Oscillating, longitudinal axis |
| 432 | DF | .~ Risers |
| 433 | DF | .~ Vertical motion |
| 434 | DF | .~ Flexible rail |
| 435 R | DF | .~ Point |
| 436 | DF | .~.~ Recessed rail |
| 437 | DF | .~.~ Renewable and reenforced |
| 438 | DF | .~.~ Point and mate |
| 439 | DF | .~.~ Tandem |
| 440 | DF | .~.~ Three throw |
| 441 | DF | .~.~ Tread guard rail |
| 442 | DF | .~.~ Tongue |
| 443 | DF | .~.~.~ Bed lock |
| 444 | DF | .~.~.~ Self-cleaning |
| 435 A | DF | .~.~ Guard |
| 445 | DF | .~ Stub |
| 446 | DF | .~.~ Double rail |
| 447 | DF | .~.~ Anti-creep or jar |
| 448 | DF | .~ Lock |
| 449 | DF | .~ Tie bars |
| 450 | DF | .~.~ Adjustable |
| 451 | DF | .~.~.~ Eccentric |
| 452 | DF | .~ Connecting rods |
| 453 | DF | .~ Chairs and plates |
| 415 A | DF | .~ Toy |
| 454 | DF | CROSSINGS, FROGS, AND MATES |
| 455 | DF | .~ Outer-tread-supported wheel |
| 456 | DF | .~ Tread guard rail |
| 457 | DF | .~ Flange-supported wheel |
| 458 | DF | .~.~ Frogs |
| 459 | DF | .~ Hot filled |
| 460 | DF | .~ Central inserts |
| 461 | DF | .~.~ Cast bound |
| 462 | DF | .~ Plate or plate bolted |
| 463 | DF | .~ Bolted |
| 464 | DF | .~ Solid |
| 465 | DF | .~ Crossings |
| 466 | DF | .~.~ Street and steam |
| 467 | DF | .~.~ Chairs |
| 468 | DF | .~ Frogs |
| 469 | DF | .~.~ Unbroken main |
| 470 | DF | .~.~ Clamped |
| 471 | DF | .~.~ Composite |
| 472 | DF | .~ Details |
| 473 R | DF | SIGNALS |
| 473.1 | DF | .~ Highway crossing |
| 473.2 | DF | .~.~ Wigwag type |
| 473.3 | DF | .~ Light beam projecting |
| 474 | DF | .~ Track reflectors |
| 475 | DF | .~ Dwarf or pot |
| 476 | DF | .~ Switch or switch stand |
| 477 | DF | .~ Roadway, visual, and portable |
| 478 | DF | .~ Enclosed |
| 479 | DF | .~ Semaphore |
| 480 | DF | .~.~ Upper quadrant |
| 481 | DF | .~.~ Home and distant |
| 482 | DF | .~.~ Arms |
| 483 | DF | .~.~.~ Illuminated |
| 484 | DF | .~.~ Lamp and spectacles |
| 485 | DF | .~.~ Post mechanism |
| 486 | DF | .~ Bridge warnings |
| 487 | DF | .~ Torpedoes |
| 488 | DF | .~ Trainmens' kits |
| 473 A | DF | .~ Toy rail signals |
| 489 | DF | MANUAL ACTUATION |
| ****************************** | ||
| DIGESTS | ||
| ****************************** | ||
| DIG 1 | DD | Radiant energy devices |
| DIG 2 | DD | Thermal sensing devices |