In v1911, I've extended the "T" key to refill with water, coal, or diesel oil while the loco or tender is alongside the "pickup" point. Refilliing is no longer instant - you have to keep the T key pressed. If you are not close to the pickup point, then OR reports the distance away instead.
There are some limitations - if your loco or tender has not been modelled with intake points, then refilling is not available.
Still to be implemented:
- allowing for the position of the intake on the wagon/loco.
- allowing for the rate at which the pickup can supply.
- refilling any but the first loco in the player's train.
- refilling AI trains.
- animation, e.g. of water columns.
- starting activities with tanks that are not full.
Please give it a try, but bear in mind that locos start with their tanks full so, after arriving alongside a pickup point, you may find the tank doesn't need filling.