I thought I’d share this for people in a similar situation to me – very occasionally needing to refer to a specific wheel position on a locomotive. Strangely this information isn’t easy to come by online.

Sometimes working out which is No. 1 end on an intermediate vehicle can be a pain, so it’s best to refer to drawings if possible.

Number 1 wheel is usually marked by an arrow above it on the vehicle body. It can be difficult to spot if you’re not certain. If the vehicle is a driving vehicle in a Multiple Unit or other vehicle with only one cab, No. 1 end is going to be the cab end.