[0.13.x] Train Schedule improvement - Fuel display summary

[BlackKnight]

Now with the great new Train Schedule window/system, it would be great to show a fuel status summary added to the new train schedule. In the past its always been a two step process which meant I rarely checked it--until it was empty.

The Gauge Level if low could change icon colour or the level could blink. Since there are different types of fuel, on mouseover of the fuel summary, an estimate of time remaining (based on conversion of current fuel(s), at Full Speed with Current Load could also be displayed). This mouseover summary could also display the status of other locomotives in the group listed in order from first to last.

See image for ref with two concepts
See my related suggestion of Always displaying Cargo button

[Neotix]

Because of different typed of fuel (also in mods), it should just summarize energy and show "Fuel = 1652MJ"

[ssilk]

Depending on a statistic the train can make internally it can also calculate how much kilometers it estimates to run with this amount of energy. That statistics can be used also to calculate, when a train needs to be refueled.

[BlackKnight]

Both great points. A lot of information could be derived from the amount of fuel remaining.

eg [Fuel = 1652MJ] - Mouseover to get detailed stats.. [Refuel in 321 km / 5:31hs. Fuel storage at 51% capacity]

But due to schedules not being locomotive dependent, I think it would make sense to include additional details on other locomotives on the mouseover popup.
Assuming four locomotives in Train grouping: (numbers made up) (periods used as spacers since multiple spaces arent recognized by phpbb)
-------------------------------------
Present Train Fuel Summary
Locomotive #1 [Fuel = 1652 MJ] (Refuel in: 321 km / 5:31hs. Fuel storage: 51% capacity)
Locomotive #2 [Fuel = ...13 MJ] (Refuel in: .21 km / 5:31hs. Fuel storage: ..7% capacity)
Locomotive #3 [Fuel = 2052 MJ] (Refuel in: 452 km / 5:31hs. Fuel storage: 76% capacity)
Locomotive #4 [Fuel = 1112 MJ] (Refuel in: 267 km / 5:31hs. Fuel storage: 15% capacity)

Something to note is that many factorio players have automated setups to auto fuel their trains, so some may argue whether this is useful. This would be useful for those that are new/don't have automation setup yet/have long trips to outposts/ but I think the most useful reason is those wanting to get a better sense of really how frequently they need to refuel. This would also more easily highlight the importance to the player of using better quality fuel because it lasts longer and therefore an easy to understand bit of information that could really help making a train network more efficient (less stops to refuel if managed intelligently).