yes thats my understanding as well
there is a main transmission drive shaft, from the tender motor to all of the wheels-really no different than when a motor sits in the loco and powers gears via worms and idlers
you have a superb loco
it is not weather proof
light lube of all moving parts would be recommended-use a fine light oil or graphite on the cylinder and crank bits (these have little strain-they simply turn without load-they may not need it at all-but lube should help and make everything silent) , and a high quality teflon or LGB grease aplied sparingly on the angled gears on the drive shaft and wheels themselves, as well as the univeral joints, and the male female bits that slide in and out of the drive shaft that allow the trucks to pivot and still be connected to the shaft- as will these portions take the most wear-keep it clean of grit obviously
and while i dont KNOW
based upon the experience i have with my LGB/Aster frank s -I have ordered parts from time to time -aster is sturdy, but stuff happens even with care
i strongly recommend extreme care when handling as well as avoiding running accidents
as while some parts may still be around-i wouldnt bet on the ones you might need-its hit and miss in my experience on these lower production and older locos -no doubt something critical , like a driver or connecting shaft, might not be around , but they might have dozens of headlights for example-one you cant get by without , the other is easily replaced and wont make the loco useless (recently had this very issue )
i would also suggest periodically checking the tightness of all exposed screw heads, etc-gently tighten any that might work loose-im my experience, they do (but mine is live steam)
since some are so tiny-they can be lost even on your own track in the garden
now
if you would be so kind
please post several pics -up close and detailed of your new beast
while im certain there most be a UK aster rep-the aster rep in the USA-Aster hobbies USA might be able to at lest provide you with a photocopy of the owners manual-hope that helps-his name is hans huwyler and he is a wonderful guy-and doesnt have any of the typcial fooling around/delay/disinterest in getting parts and other little stuff