43096
On Moderation
- Joined
- 23 Nov 2015
- Messages
- 15,348
There's only been a small number of vehicles converted from HST to LHCS spec: RFMs 10200-211.The DVTs are LHCS mark 3s and I linked you to a photo which shows a DVT with 125mph on the data panel. Also, I have seen other mark 3 LHCS with 125mph on the data panel (although some are 110mph as you say). For example, Arriva Trains Wales mark 3 buffet 10249 is/was marked as 125mph, were this and other 125mph mark 3s converted from IC125 vehicles?
The real issue is braking. The secret of the HST is faster brake propagation from the E70/DW2 brake units in both power cars. The LHCS DVTs also had such a brake unit, but AFAIAA they generally ran with just the leading brake unit (E70 or DW3) controlling the train, partly because the locos were 110mph limited so it wasn't needed and partly for reliability as the rear brake control unit could be isolated and not suffer spurious activations if, for example the TDM de-configured.