The 57 on the WAG Mon to Friday, is never switched off,left ticking over all night, It is my impression with the switch at Chester the rear end 57 was in fact ticking over on departing Holyhead?. 57s according to a driver I spoke to said they are awful to start up from cold.
The triangle at Chester could not be used with passengers on board. I also think to 30 mins at Chester was just in case of problems,
TDK will give chapter & verse on 67s start up,he drives them,I also recall Andy Hamilton CEO of W/S telling me, "I would not touch 57s with a barge pole,too unreliable"
Also good to learn the main traffic of passengers was from Wrexham,for once ATW advertised the fact it was running a Rug Ex special, only £18 return for over 55s.
Bob
From cold a 67 will start immediately and it takes about 10 minutes for the air to build up and to overcharge - prep on a 67 takes 25 minutes.
If you have a 57 idling on the rear unless there are fire precautions on the 57 this is not permitted unless you have a fireman in the rear cab to shut the engine down in case of a fire this is the reason the 67's have to be fitted with fire precautions when used with a DVT. A 67 without fire precautions MUST be dead hauled.
The 30 minutes at Chester - was this not a run round time?
When changing ends with 2 x 67 with 1 dead hauled you are looking at least 15 minutes turn round including disposal of the leading loco, setting up the rear loco, a brake test and overcharge, with a DVT about 5 mins but the set will then need to be overcharged on the run, this is possible but not the ideal scenario.
57's were not really designed for this sort of work and to be honest are a poor loco, they are really souped up 47's and these locos were always problematic in their late days.
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One imagines, and hopes, that as a fairly modern loco it can just switch its drive from one direction to another.
If you read the above post it is not as easy as that - 67's were not designed to do push pull
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I would imagine a 57 is capable of that too, it's just when reversing a top&tail train (with one loco dead on rear, rather than being on and wasting fuel) you have to start it up. Still suprising that it takes 30 minutes to power a loco up though.
You may find the unions will govern the time taken. To change ends with dead haul you have:
1. Shut down leading loco
2. Batteries out (may need a block for this)
3. Isolate parking brake
4. Tail lamp to rear
5. walk length of train.
6. Batteries in now the front loco (may need a block for this)
7. Remove tail lamp
8. reinstate parking brake
9. Start front loco
10. Brake test with a competent person
11. Overcharge
So it's just not pushing the start button.
With a DVT it is a lot quicker
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