Cold trains in heated tunnel

[A-H]

Hi all,

I'd like to simulate a heated underground tunnel with incoming trains. The trains will have a given surface temperature, depending on the outdoor temperature. While being parked in the tunnel they'll act as a cooling load, and I need to design the heaters to match this. Also this needs to be done as a dynamic year simulation, since I'm also interested in how long it takes to heat the surrounding rock. This could be up to a few months, depending on the capacity of the heaters.

Now, to simplify let's work with the principle that we have one train, coming in every day of the year at 1:00 am. It will be parked in the tunnel for 5 hours, and then depart.

What would the best practice be to simulate this?

Can I use components somehow?

Or should I simply create a chilled ceiling in ApacheHVAC with the corresponding mass of a train? -- I'm not sure how to make this act the way I want it to though.

Thanks in advance for any helpful tips.