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| Class 246 | RAILWAY SWITCHES AND SIGNALS |
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![[List of Pre Grant Publications for class 246 subclass 1R]](../as.gif) | ![[List of Patents for class 246 subclass 1R]](../ps.gif) | 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 |
| | 28H | Intermittent light |
| | 28K | Transformer |
| | 93 | Combined fluid pessure and electric |
| | 96 | Electromechanical |
| | 100 | Fluid pressure |
| | 102 | Mechanical |
