PRR 1956 1956 As described in the October 28, 1956 version of the PRR publication "Rules for conducting transportation", Signal Rules. 200920102018JMRI DickBronson dick@rr-cirkits.com BobJacobsen jake@physics.berkeley.edu 1 2009-12-21 RGJ Initial version 1.1 2009-12-27 DB, RGJ Fix consistency, more aspects 2 2010-01-01 DB More appearances 2.1 2010-01-01 RGJ Add author and revision info 2.2 2010-01-11 DB Typo Correction 2.3 2011-06-23 DB Add speed and route information 2.4 2011-12-06 KC Normalize all aspect names to not have hyphens 2.5 2018-06-22 DB Update to match PRR 1956 rules Clear Block Rule 280 Proceed, manual block clear Page 53 Normal Normal Normal Clear Rule 281 Proceed Page 54 Normal Normal Normal Approach Medium Rule 282 Proceed approaching next signal at Medium speed Page 55 Normal Medium Normal Medium Clear Rule 283 Proceed; Medium speed within interlocking limits Page 56 Medium Normal Diverging Medium Approach Rule 283A Proceed at Medium speed prepared to stop at next signal. Train exceeding Medium speed must at once reduce to that speed Page 57 Medium Medium Diverging Approach Slow Rule 284 Proceed approaching next signal at slow speed. Train exceeding medium speed must at once reduce to that speed. Page 58 Medium Slow Normal Approach Rule 285 Proceed prepared to stop at next signal. Train exceeding Medium speed must at once reduce to that speed. Page 59 Medium Slow Normal Caution Rule 285A Train exceeding Medium speed must at once reduce to that speed. Where a facing switch is connected with the signal, approach that switch prepared to stop. Approach next signal prepared to stop. Page 60 Medium Slow Either Slow Clear Rule 287 Proceed; Slow speed within interlocking limits. Page 61 Slow Normal Diverging Slow Approach Rule 288 Proceed prepared to stop at next signal; Slow speed within interlocking limits. Page 62 Slow Slow Diverging Permissive Block Rule 289 Block occupied; for passenger trains, stop; for trains other than passenger trains, proceed prepared to stop short of a train or obstruction, but not exceeding 15 miles per hour. Page 63 Stop Stop Either Restricting Rule 290 Proceed at restricted speed. Page 64 Restricted Restricted Either Stop and Proceed Rule 291 Stop; then proceed at Restricted speed. Page 65 Stop Stop Either Stop Rule 292 Stop. Page 66 Stop Stop Either