What did the trained engineer and son of former slaves elijah mccoy invent to improve railroad efficiency?

a method to automatically lubricate gears

While working for a railroad McCoy invented a lubrication device to make railroad operation more efficient. McCoy trained as an engineer in Scotland as a teenager. He showed a strong interest in mechanics from a young age

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as general terms,  indian territory,  the indian territories, or  indian country  describe an evolving land area set aside by the  united states government  for the relocation of  native americans  who held  aboriginal title  to their land. in general, the tribes ceded land they occupied in exchange for  land grants  in 1803. the concept of an indian territory was an outcome of the 18th- and 19th-century policy of  indian removal. after the  civil war(1861–1865), the policy of the government was one of  assimilation.