If you have manual firing engaged you still need to trigger it by opening the firebox doors. You need to open both front and rear dampers to at least 50%. Don’t stay in high cutoff for long. 70 to 75% should literally just be used to start off. Immediately wind back to 55 or 60 and by the time you’re doing 40 MPH the reverser should be around 25 to 30%. Don’t drive with full regulator either. Of all the flawed steamers in TSW, Flying Scotsman is pretty much the easiest to drive and never runs out of steam. Oh one more thing, it’s a while since I drove FS in game but I know on the LMS steam locos you need to keep the small ejector open about halfway to maintain vacuum or the brakes will drag.
Small ejector usually near the brake valve. If you’re on PC, check the key commands for those that open and close it. Not sure what buttons or combination thereof work on consoles.
The Flying Scotsman is fitted with air brakes so you never need to touch the ejectors (in fact, doing so was detrimental when I tried it as it applied the brakes)
Whether the ejectors are used or not depends on what coaches the loco is hauling. It can be, and is, used with both air braked (such as in ECML) and vacuum braked (such as in WCMLoS) stock in TSW. We can’t really advise on what’s causing the issue without knowing what route and service the OP is playing but it is very easy to accidentally move the ejector controls when playing on controller due to there being no dead-zone on the thumbsticks so it could be that. It occurs when opening the cylinder valves, which is a press on L3, and any slight movement up or to the right when doing so will also open the ejectors. We don’t even know if the OP is using a controller though.
I did not see that but I do now. With no further clues, such as the route and service, and whether you are losing power or it’s the brakes coming on, it’s difficult to know why you are slowing to a stop and therefore offer any help.
