Hi it was my post but I have found the answer so if anyone has the same problem here is the answer. Look at the base of the truck. There are six screws, one in each corner and two between the wheels. If that is all you can see remove them and take the bottom cover off. You will now see two more screws that hold the top cover on. Remove them and the two between the wheels. (Have a look at the videos to find them). In the videos it shows all 8 screws in the bottom plate which is what through me.

Can anyone tell me the type and size of screwdriver needed to undo the screws that hold the universal joints between stream engine and the trucks together.
Could my engine be so old that the two parts were riveted. I can see a brass end about 2.5 mm with a 1 mm hole in the middle. I have sourced a big set of small screwdriver bits none lock into the hole.

Quote from: Greg Elmassian on February 27, 2026, 02:59:43 PMBasic question: did you call Bachmann parts department?

No but the part was on their list as out of stock for a long time now it seems to not be there stall.
Is that Bachmann in the USA?

Just on the off chance. I need this part is it available anywhere, in someone's parts box, a clever person who 3d prints them etc.
I can't upload a picture so I will have to describe it:
It's the female part of the universal joint between the steam engine and rear truck part number OYAO1

I have ordered a pair of replacement trucks. Does anyone have any info or advice for fitting them, their voltage etc.

I think it's old. I have watched the videos and my trucks are different. The two screws between the wheels are as per the video. I have 6 screws in the bottom of the trucks but they are all the same length (short). There are none of the long screws that hold the top plate on. The top plate with the screws between the wheels removed is held in exactly the positions that the long screws would hold it. There are 2 screws on the top of the trucks
In the right place except they are the size of spectical hinge screws and are not accessible due to the body of the engine above.
Any help would be appreciated.