'Light' engine HST

[randyrippley]

They could open the windows and doors if necessary. Perhaps they could even isolate the gas?

looks like the connecting door IS open with someone dressed in red standing there

 

[GrimShady]

It quite obviously wasn't "utter tosh" since we have photographic evidence of not only the passengers IN the unit but also getting off and into private cars soon after.

My posting of "utter tosh" was in reference to ScotRails reasons for not using the van space. These pictures prove it wasn't a consideration back then when I assumed they were using HALON which was a much more dangerous gas.

 

[hexagon789]

My posting of "utter tosh" was in reference to ScotRails reasons for not using the van space. These pictures prove it wasn't a consideration back then when I assumed they were using HALON which was a much more dangerous gas.

I thought a master key in the cab isolated the automatic fire extinguishers until it's removal or pressing of the button, it only being operative in the rear unmanned power car?

 

[heedfan]

I thought a master key in the cab isolated the automatic fire extinguishers until it's removal or pressing of the button, it only being operative in the rear unmanned power car?

Correct - the desk needs to be shut down for the automatic fire extinguisher to kick in. To be specific, you don't need to physically remove the key, simply moving the selector handle to 'off' does the job.

 

[hexagon789]

Correct - the desk needs to be shut down for the automatic fire extinguisher to kick in. To be specific, you don't need to physically remove the key, simply moving the selector handle to 'off' does the job.

In which case there was no danger of it going off spontaneously when that light power car shuttled people on the Newquay branch then

 

[TractiveEffort]

It was a Halon based system, which can no longer be used as (I think) it is an ozone depleting gas. The opportunity was taken when fitting Inergen to have the system cover the clean air compartment as well as the engine room.

If the fire system went off, you’d do an emergency evacuation of the guards van area of the power car, long before any gas killed anyone. The guards van was never included in the discharge system, so the risk would be virtually zero.

 

[43096]

If the fire system went off, you’d do an emergency evacuation of the guards van area of the power car, long before any gas killed anyone. The guards van was never included in the discharge system, so the risk would be virtually zero.

Indeed, and you have the cooler group (with the open to atmosphere grills on the side) between the gas and anyone in the van. Bigger risk is someone in the trailing cab, as the fire system covers the clean air compartment next to it.

I just do not understand ScotRail's issue with it.

 

[GrimShady]

Indeed, and you have the cooler group (with the open to atmosphere grills on the side) between the gas and anyone in the van. Bigger risk is someone in the trailing cab, as the fire system covers the clean air compartment next to it.

I just do not understand ScotRail's issue with it.

Neither do I as the engine compartment should be gas tight otherwise any discharge of fire suppression would be useless. This is why I accused ScotRail of talking utter tosh.

 

[43096]

This is why I accused ScotRail of talking utter tosh.

I did hear a story - you'd hope apocryphal - that when ScotRail modified Haymarket for the HSTs they put fuel points in for every vehicle in the set and not just the power cars... It would explain a lot if true!

 

[GrimShady]

I did hear a story - you'd hope apocryphal - that when ScotRail modified Haymarket for the HSTs they put fuel points in for every vehicle in the set and not just the power cars... It would explain a lot if true!

I can believe that!

 

[fgwrich]

Although a big chunk of that (Inergen fire bottles, OTMR etc) wasn’t fitted back then.

You've also got the fairly large but clever engine management system on that wall as well. Another chunky box to reduce some of the pace in there.

However, given that LNER is fairly happy to use the van space when needed, ScotRails aversion still is, like you say, bizarre.

 

[TractiveEffort]

You've also got the fairly large but clever engine management system on that wall as well. Another chunky box to reduce some of the pace in there.

However, given that LNER is fairly happy to use the van space when needed, ScotRails aversion still is, like you say, bizarre.

That wasn’t there in Valenta days and it’s not the engine management system, that’s the MDEC which is bolted to the non alternator end of the engine. The box contains the interface between powercar and MTU, mostly relays.