Railways in the Niagara Region
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Block Signal Guide

This guide is posted here only as a reference tool, and is not to be used as a 100% accurate guide to railroad operations. Due to the limitations of graphic designs, not all signal indications are 100% accurate, and may contain errors and/or omissions.

Signal graphics have been provided courtesy of Josh Andrechek. You can visit his site, Ottawa Valley Railfan's Page, by clicking here.

Rule Aspects Name Indication
405 Clear Signal Proceed.
406 Clear to Limited Proceed, approaching next signal at limited speed.
406A Clear to Limited Proceed, approaching next signal at limited speed.
407 Clear to Medium Proceed, approaching next signal at medium speed.
407A Clear to Medium Proceed, approaching next signal at medium speed.
408 Clear to Slow Proceed, approaching next signal at slow speed.
408A Clear to Slow Proceed, approaching next signal at slow speed.
409 Advance Clear to Stop Proceed, next signal is displaying Clear to Stop, be prepared to stop at second signal.
410 Clear to Stop Proceed, preparing to stop at next signal.
411 Limited to Clear Proceed, limited speed passing signal and through turnouts.
412> Limited to Limited Proceed, limited speed passing signal and through turnouts, approaching next signal at limited speed.
413 Limited to Medium Proceed, limited speed passing signal and through turnouts, approaching next signal at medium speed.
414 Limited to Slow Proceed, limited speed passing signal and through turnouts, approaching next signal at slow speed.
415 Limited to Stop Proceed, limited speed passing signal and through turnouts, preparing to stop at next signal.
416 Medium to Clear Proceed, medium speed passing signal and through turnouts, approaching next signal at medium speed.
417 Medium to Limited Proceed, medium speed passing signal and through turnouts, approaching next signal at limited speed.
418 Medium to Medium Proceed, medium speed passing signal and through turnouts, approaching next signal at medium speed.
419 Medium to Slow Proceed, medium speed passing signal and through turnouts, approaching next signal at slow speed.
420 Medium to Stop Proceed, medium speed passing signal and through turnouts, preparing to stop at next signal.
421 Slow to Clear Proceed, slow speed passing signal and through turnouts.
422 Slow to Limited Proceed, slow speed passing signal and through turnouts, approaching next signal at limited speed.
423 Slow to Medium Proceed, slow speed passing signal and through turnouts, approaching next signal at medium speed.
424 Slow to Slow Proceed, slow speed passing signal and through turnouts, approaching next signal at slow speed.
425 Slow to Stop Proceed, slow speed passing signal and through turnouts, preparing to stop at next signal.
426 Restricting Signal Proceed at restricted speed.
427 Special Protection Signal Stop, then proceed at restricted speed and preceded by a flagman when necessary to ensure full protection.
428 Stop and Proceed Signal Stop, then proceed at restricted speed.
429 Stop Signal Stop.
430 NOTE: Lighted "S" or flashing light is used in conjunction with a block or interlocking signal. Take (or leave) Siding Signal Be governed by signal indication. Take (or leave) siding or other designated track when "S" lighted or light flashing.