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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 246 | RAILWAY SWITCHES AND SIGNALS |
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| 1R | MISCELLANEOUS |
| 2R | TRAIN DISPATCHING |
| 3 | Central signal control |
| 6 | Train-order cab signal or train control |
| 7 | Train telegraphy or telephony |
| 14 | Station, block, or train-order signals |
| 2E | Orientation |
| 2F | Frequency |
| 2S | Spacing |
| 19 | STAFF AND TABLET SYSTEMS |
| 20 | BLOCK-SIGNAL SYSTEMS |
| 21 | Semi-automatic |
| 27 | Automatic |
| 28R | Electric |
| 29R | Radiant energy |
| 31 | Propulsion-current control |
| 33 | Single track |
| 34R | Varying-current track circuit |
| 35 | Propulsion-current return |
| 38 | Wireless distant control |
| 39 | Line-wire distant control |
| 40 | Single block |
| 34A | Approach control |
| 34B | Coded circuits |
| 34C | Insulation breakdown |
| 34D | Saturable reactors |
| 34CT | Continuous track |
| 41 | Direct current, normally closed, track circuit |
| 42 | Propulsion-current return |
| 44 | Wireless distant control |
| 46 | Line-wire distant control |
| 47 | Cab signal or train control |
| 50 | Current characteristic |
| 51 | Overlapped blocks |
| 52 | Home and distant |
| 53 | Three position |
| 54 | Single block |
| 58 | Direct-current, normally open, track circuit |
| 61 | Superimposed propulsion current |
| 62 | Cab signal or train control |
| 63R | Inductive |
| 64 | Train-carried current supply |
| 72 | Propulsion-current signaling |
| 73 | Continuous contact |
| 74 | Intermittent contact |
| 75 | Bridged insulated rail joint |
| 76 | Track trip |
| 77 | Counting in and out |
| 81 | Propulsion-current signaling |
| 86 | Train-carried current supply |
| 87 | Line-current supply |
| 88 | Intermediate signal |
| 89 | Short sectional rail closure |
| 90 | Car-actuated controller |
| 92 | Intermittent contact |
| 28C | Ballast leakage |
| 28E | Economy use of line wire |
| 28F | Checking circuits |
| 28G | Light-out |
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