Sam and I have also been working on the smoke passes to try and get these looking quite realistic. Getting the colouring and feel of the smoke is quite difficult in Maya alone so using After Effects also I have managed to manipulate the render to look good. Sam has created a basic smoke emitter in Maya and then parented this to the funnel which I have exported from the scene of the shot. This then ensures everything matches up, along with the camera angle also.
His final render then looks something like this, and then in After Effects we place this behind the train layer and composite it in. I have then added a number of effects to alter colour, tone, contrast and blur on this layer and then duplicated also to use two contrasting layers which multiply through one another. This gives us a final effect like in the example below.
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