HTO/HTV Wagon Design Code Differences

[Jr_Vandalas]

I've been doing a dive in on the 21t 4-axle Hopper wagons, the HTOs and HTVs specifically, before trying to find a look on the differences on the design codes. Other than some notable differences between the rebodied hoppers (HTO-R, HTV-R & HTV-S), are there any more differences between the design codes of the HTO/HTVs? It's stumped me for a while!

 

[eastwestdivide]

There was a relatively small batch of HTV numbered B340xxx (outside the B4xxxxx series for most HTO/V). They turned up on aggregate workings from Westbury etc and I think they were rated 25T instead of 21T. I'd imagine that would warrant a different design code.

 

[Gloster]

There was a relatively small batch of HTV numbered B340xxx (outside the B4xxxxx series for most HTO/V). They turned up on aggregate workings from Westbury etc and I think they were rated 25T instead of 21T. I'd imagine that would warrant a different design code.

I think that the main difference with these wagons, which apparently included a few HTO, was respringing. I will look out David Monk-Steel’s book on hopper wagons.

You also have the LNER design wagons which had a different style of handbrake. There is more on this in Vol. 7 of Larkin’s history of BR’s acquired wagons, but I only picked that up yesterday.

 

[eastwestdivide]

respringing

That would make sense

 

[Gloster]

A quick look at David Monk-Steel’s HMRS book lists the main differences as: HTO/P/V-D as standard design including rebuilt, HTO/V-R as two stanchion rebuilt and HTO-S as rebuilt and resprung for 25 tonnes. However, there are a lot more differences: there are thirty-seven different Design Sheet codes for the -D alone, although many may just be related to lot numbers.

If you are really interested you need the book: it has numerous drawings of these designs alone.