Reasons

• It is strange to use diesel locomotives in space (for obvious reasons) - with all of this hi-tech materials new trains are needed.
• Vacuum/low pressure and low-gravity
• Using magnetic power to stay on tracks in space and even in high-speed
• Electric power is easier to get in space and it does not need oxygen

Detail

• New locomotives has internal battery (no big capacity) which can be charged with multiple sources
• New variants with those efficient flat solar panels on rooftop can be enabled
• Charging from internal equipment grid
• Charging station for low-solar sorfaces
• Electric power is equally distributed between all locomotives in train and wagons can help with power too
• New trains are faster with better acceleration (usig holmium magnets, low-weight components and high power), but with 50% power efficency (that power is needed to stay on tracks)
• Have slighly higher capacity
• Can be used on surface too (good aerodynamics and they still have wheels too)
• Low health/resistances - not very good for dangerous zones
• Charge state is visible as remaining fuel (sorry, no other visuals available now)
• Train must be at least 10% charged to move (odd behaviour on low power)
• Currently no special research - trains are unlocked by Space rails and Flat panels
• And

Short variants

• Short variants with lower capacity can be enabled
• In SE many items are needed in low/medium quantities, but many types of them are needed, so train stations for normal trains can use a lot of space
• Locomotives/cargo wagons are of length 2,5 (normal size is 6), so 2 of them fits nicely in space of normal sized wagon
• Short fluid wagons are of size 3 - pumps are very sensitive on positioning
• Short fluid wagons must have odd number of short-sized locomotives/cargo wagons in front of them, but there can be any number of normal sized ones or short fluid wagons (see picture)

Charging from equipment grid

• At least 1 battery must be present
• Options available to enable equipment grid (on space trains only)
• All locomotives/wagons with grid in train contributes to this
• Settings to limit charging
• - Maximum fuel state of train do drain battery (good with using solar variants)
• - Minimum battery state - when that power is needed for defense
• - Minimum fuel state - if it is too low, minimum baterry state is ignored (when mobility is more important then defense)

Warnings

• This is my first mod and i am not good at graphics (using Blender for the first time)...
• I have not tested this in multiplayer
• Maybe it could use some optimizations (but it seems to be not too much UPS heavy)
• I am using them for some time and they works nicely

Possible future changes

• Electric fuel state visualization - but i have not needed this, so not top priority
• Some optimizations
• HD graphics
• Graphics tweaks (like cargo wagons have no moving doors)
• Better integration with some mods (for equipment grid)
• Standalone variant (if needed)