Hello can someone help me to interpret this dream please.

Last night I dreamt that I was on a train but some how I find myself outside of the train and backpack was left on the seat. I was at the back end of the train this did not look like a normal carriage for people. I was walk along the side of the train trying to find access to get back inside.
The train was heading towards a tunnel and I was hanging on the outside of the train. I find a small open to squeeze in before been crashed against the train and wall of the tunnel. As soon as we exist the tunnel the back end of the train get separated by some workmen. I asked them why the why them did say but I can’t remember. So I find myself with no way to catch up with the train even though I was still to walk down to train because the end was stopped on a hill.
I remember thinking how was going to managed with my phone, purse and etc.