Add setting for whether non-leading train engines keep custom names

src/table/settings/settings.ini

@@ -1503,6 +1503,14 @@ strval   = STR_JUST_VELOCITY
 cat      = SC_EXPERT
 patxname = ""vehicle.rail_depot_speed_limit""
 
+[SDT_BOOL]
+var      = vehicle.non_leading_engines_keep_name
+def      = false
+str      = STR_CONFIG_SETTING_NON_LEADING_ENGINES_KEEP_NAME
+strhelp  = STR_CONFIG_SETTING_NON_LEADING_ENGINES_KEEP_NAME_HELPTEXT
+cat      = SC_ADVANCED
+patxname = ""vehicle.non_leading_engines_keep_name""
+
 [SDT_BOOL]
 var      = pf.forbid_90_deg
 def      = true