During the 1800’s, a railway signalman who lost his legs in an accident, purchased a baboon. The baboon began to operate the railway, and was eventually given a job and salary. In 9 years of employment, he never made a mistake.
The baboon essentially reacted to whistles from the trains. Each train had a different whistle and the Baboon learnt each trains noise, and set up the signals accordingly.
When complained about, the railroad came to fire him and his handler. The handler convinced management to let the Baboon work for an hour while they watched. It was said the Baboon never took his eyes off the management as he performed his duties to perfection, thus convincing the railroad to employ him because of how accurate and good his signalling was.