See note below
| Rule | Aspect | Name | Indication |
| 240-A1 | | Stop | Stop before any part of train or engine passes the signal |
| 240-A2 | | Stop and Proceed | Stop before any part of train or engine passes the signal, then proceed at Restricted Speed through entire block |
| 240-A3 | | Flashing Stop and Proceed | Stop. Block occupied. Proceed at Restricted Speed |
| 240-B | | Permissive | Proceed at Restricted Speed without stopping. (Used with signal 240-A2) |
| 240-C | | Approach | Proceed prepared to stop before any part of train or engine passes the signal |
| 240-D | | Clear | Proceed |
| 240-E | | Limited Approach | Proceed not exceeding 50 mph prepared to stop at next signal |
| 240-F1 | | Limited Clear Approach Slow | Proceed not exceeding 50 mph approach next signal not exceeding 15 mph |
| 240-F2 | | Limited Clear Approach Medium | Proceed not exceeding 50 mph approach next signal not exceeding 30 mph |
| 240-G | | Approach Limited | Proceed. Approach next signal not exceeding 50 mph |
| 240-H | | Limited Clear | Proceed; 50 mph within interlocking limits Approach next signal not exceeding 50 mph |
| 240-I | | Medium Approach | Proceed not exceeding 30 mph prepared to stop at next signal |
| 240-J1 | | Medium Clear Approach Slow | Proceed 30 mph within interlocking limits. Approach next signal not exceeding 15 mph |
| 240-J2 | | Medium Clear Approach Medium | Proceed 30 mph within interlocking limits. Approach next signal not exceeding 30 mph |
| 240-K | | Approach Medium | Proceed. Approach next signal not exceeding 30 mph |
| 240-L | | Medium Clear | Proceed; 30 mph within interlocking limits |
| 240-M | | Slow Approach | Proceed not exceeding 15 mph prepared to stop at next signal |
| 240-N | | Slow Clear Approach Medium | Proceed; 15 mph within interlocking limits. Approach next signal not exceeding 30 mph |
| 240-O | | Approach Slow | Proceed. Approach next signal not exceeding 15 mph |
| 240-P1 | | Slow Clear | Proceed; 15 mph within interlocking limits |
| 240-P2 | See note below | Slow Clear | Proceed not exceeding 15 mph |
| 240-R | | Restricting | Proceed at Restricted Speed not exceeding 15 mph |
Note: On most railroads the presence or absence of a number plate is significant only to distinguish between a Stop signal and a Stop & Proceed signal. However, on the NP and the SP&S the number plate is also significant on the Slow Clear signal.
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Created 12-27-2002
Updated 05-05-2003