This HO Scale Class I1sa 2-10-0 from Broadway Limited is ideal for your mid-1920s and later layout. In 1916, the Pennsy railroad developed a new, supersized 2-10-0 steam engine that was powerful enough to move the tremendous amounts of coal and ore being moved on the system. Initial tests were impressive, and between 1918 and 1923, the PRR built 598 Class I1s Decapods. They were the largest 2-10-0 steam locomotives in the United States, and they became the dominant freight locomotives on the PRR railroad system until World War II. Sometimes called "hippos" - the I1s's were huge. Unfortunately, the large boiler size limited the amount of space for large driving wheels, and the result was a hard ride and hard work for crews. Their power was undeniable, and they remained in service until the end of PRR steam in 1957. This model is of the sub-class I1sa locomotive on which the Pennsy increased the maximum steam cut-off, boosting low speed tractive effort - 489 of the hippos were eventually converted. This detailed Class I1sa features full Paragon4 sound and DCC for realistic sound and motor control complete with back EMF for smooth slow speeds. The Paragon4 sound system works with all Broadway Limited Rolling Thunder(TM) advanced sound systems. Other features include a heavy die cast body and chassis; smooth-running drive, applied details; directional warm white LED lighting and magnetic knuckle couplers. The HO Scale Class I1sa 2-10-0 can be operated on all DCC systems as well as on standard DC railroads (with limited sound functionality). This model has wheels profiled to operate on Code 70 and larger rail and curves of 18" radius or larger are recommended. The Class I1sa 2-10-0 is one of many Broadway Limited HO Scale Paragon4 locomotives.