|
G'day BW,
Did yer colleague excuse his buffer snot by saying that he had recently watched the flick Silver Streak.
The train slamming into the terminal concourse.
Our Southern Aurora overnighter eggspress snotted the buffers at Sydney terminal station many moons ago.
The train had locos with B7EL Westinghouse brake valves.
The train lobbed into Sydney in the morning and most of the cattle were having showers etc.
There was naturally a big drain on the air pressure supply to the water system.
That air pressure coming from the brake pipe via carriage triple valves.
The hogger made a minimum reduction in the brakes as he entered the yard.
With B7EL that means that the air ports are lapped.
With so much air being fed into the water supply system, the brake pipe air pressure reduced quickly.
This had the initial effect of applying the brakes more and almost stopping the train.
So, the driver moved the valve to release to recharge the brake pipe and auxiliary tanks.
But, the brake pipe air went to the water supply system instead of the wagon auxiliary's.
When he had to again apply the brakes there was almost nil air in the wagon auxiliary reservoirs to go to the brake cylinders.
The train consequently didn't stop and snotted the buffers.
Well, he stood the cattle up ready to get out.
The 26L brake valve has pressure maintaining feature which would prevent this situation, supposedly, unless the air drain was very severe.
When I had some fun on our dinkum Silver Streak back in 1989, I had to drain the water supply high pressure supply on one wagon.
It had caused a locked up volume in the auxiliary tank, brake cylinder and water supply side of the triple valve.
The water supply system was back feeding into the brake cylinders applying the brakes.
The cattle weren't having enough showers or flushing the dunny sufficiently.
Yes, changing ends on a double ended dmu or emu is a simple way of setting back.
Providing that you can under the rules.
But, verboten here for a crew member to open a door to lean out and control a set back motion.
He might fall out.
So, that crew member must walk along in the four foot controlling the set back movement.
Ah, just love the modern day rule book.
Enjoying retirement away from that modern day rule book Steve.
|