well i like the cities as it is (may be a bit more detiled, but...). If you are going to change anything i would like it to have more factory style chemnies... I would also need another version as a raft city and another as a ice city (if you have the time/ feel like it

)
As for getting over the himalayas im not sure if thats going to happen... if you think about it if tractionists were able to attack small helpless cities then they would be wiped out within a few turns... theres a reason they are in the himalayas... so cities will not beable to cross moutians and (if its a land/ice unit) water/rivers.
tractionist to anti-tractionist warfare will happen mostly in the air so thats what the airship is for.
ps.. my internet was down for a bit so i wasn't able to say much the last few days but i fixed it