Sentence:  With a recent email from Mike Tetlow, I found out that there were two other 37s [37252 and 37031] present that day, also shuttling between Cambridge and Kings Lynn. As you correctly observe, the pic of little me shows that I am in a Dutch liveried <WSD>tractor</WSD>. 
Meaning of the word marked with <WSD> tags:  A British Rail Class 37 locomotive.