Vintage Marklin Live Steam Gauge 1 LMS Express Locomotive, internally fired.  Large 1" dia. smoke tube will raise steam without a suction fan but you'll save time and fuel if you have one.  Steam dome is not original and front pilot wheels are cast iron replacements. 
Overall length 22-3/4" buffer to buffer, height at cab is 5-5/8 ", width at footplate is 3-1/2". Weight is prox. 8 lbs. The scale looks to be 10mm or 1/30.  No returns.