02-03-2018, 12:20 AM
(02-02-2018, 08:51 PM)Canard Wrote:(02-02-2018, 02:41 PM)KevinT Wrote: The signals at Bearinger Rd worked perfectly but the ones at the Quiet Pl and Old Albert St pedestrian crossings still clearly needed some tuning.
I generally very much appreciate that "things are hard", and am usually the first to hold up my hand and stop people from being negative toward crews and so on. I work in automation, and design complex, million+ dollar systems for cleanrooms with 20+ servos and hundreds of sensors.
...but I absolutely cannot fathom why it is so hard to get railway signals to work properly. Why is this so hard?!!?! IT'S ONE INPUT.
Our Grade crossing signals i don't think are single input. There's 4 different types of track circuits that could have been implemented on the line:
Quote:Project Agreement Schedule 15-2 Article 8 Train Control Systems
8.15 Track Circuits
(a) Track circuits, which are capable of operating in dc electrified territory without interference from the LRV propulsion system or high power lines, shall be utilized in signaled areas for LRT and freight railroad vehicle detection. Track circuits shall be capable of operating in the vicinity of high voltage lines that are overhead or buried close to the LRT tracks. Track circuit types shall include:
(i) Audio frequency overlays for crossing warning systems, if applicable.
(ii) Double-rail power frequency circuits for all main line crossovers and turnouts.
(iii) Single-rail power frequency circuits in selected areas and within crossovers.
(iv) Microprocessor based digital track circuits