Assuming that the Atronach doesn't get pissed at you for using him as a slave :hubbahubba:
I suppose that's a risk, but what does it matter to the Atronach what his summoner wants him to do? Hell, just tell him to "sit down and relax"... so long as he's sitting under the boiler chamber.
If proximity to the summoner is the problem, then hire washed out Mage Guild members as train conductors, or contract them to teach your current conductors how to perform the summoning themselves.
That's the problem with High Fantasy settings. The commonality of Magic acts as a source of extremely cheap energy, and at some point you have to address why that energy isn't being applied to completely banol matters such as transportation and industry. I think the logical conclusion of any High Fantasy setting is a Steampunk future.