SEPTA cab signal display for the 4-aspect PRR system using position light aspects. Pulse code cab signaling is a form of cab signaling technology developed in the United States by the Union Switch and Signal corporation for the Pennsylvania Railroad in the 1920s.
Measuring your Saddle Seat Size. The easiest way to measure for the appropriate seat size is to measure your upper thigh. Sit in a chair with your feet flat on the ground so that your knees are bent at a 45-degree angle. Be sure your buttocks are touching the back of the chair. Take a measuring tape and run it along your thigh bone, measuring from the end of your knee to the backside of your buttocks.
Tips and Hints for Endurance Riding. An Endurance ride is a timed test against the clock of an individual horse/rider teams ability to traverse a marked, measured cross-county trail over natural terrain consisting of a distance of 50 to 100 miles in one day. Endurance riding was first developed in the early 1900s as a military test for cavalry mounts.