Train fixes and balancing

- Slows trains to 90% of running speed
- Changes train impact damage to only take into account speed, not train length (otherwise you could insta kill people with a long enough train)
- Fixes a bug with towed cars ghosting through closed airlocks
- Stuns mobs who fall off a train that has blown up
- Fixes mobs standing/lying on vehicles
- Fixes exploding trains not decoupling correctly

Conflicts:
	code/modules/mob/mob.dm
	code/modules/vehicles/cargo_train.dm
	code/modules/vehicles/train.dm

code/modules/mob/mob.dm

@@ -914,17 +914,21 @@ var/list/slot_equipment_priority = list( \
 	if(buckled && istype(buckled))
 		is_movable = buckled.movable
 
-	if(buckled && !is_movable)
+	if(istype(buckled, /obj/vehicle))
+		var/obj/vehicle/V = buckled
+		if(stat || weakened || paralysis || resting || sleeping || (status_flags & FAKEDEATH))
+			lying = 1
+			canmove = 0
+			pixel_y = V.mob_offset_y - 5
+		else
+			lying = 0
+			canmove = 1
+			pixel_y = V.mob_offset_y
+	else if(buckled && (!buckled.movable))
 		anchored = 1
 		canmove = 0
 		if( istype(buckled,/obj/structure/stool/bed/chair) )
 			lying = 0
-		else if(istype(buckled, /obj/vehicle))
-			var/obj/vehicle/V = buckled
-			if(V.standing_mob)
-				lying = 0
-			else
-				lying = 1
 		else
 			lying = 1
 	else if(buckled && is_movable)
@@ -1229,4 +1233,4 @@ mob/proc/yank_out_object()
 
 	if(host)
 		host.ckey = src.ckey
-		host << "<span class='info'>You are now a mouse. Try to avoid interaction with players, and do not give hints away that you are more than a simple rodent.</span>"
+		host << "<span class='info'>You are now a mouse. Try to avoid interaction with players, and do not give hints away that you are more than a simple rodent.</span>"