["< sod > the two daily round - trips were branded'' turboliner'', replacing the individual names'' [ [ abraham lincoln ( train ) | abraham lincoln ] ]'' and'' [ [ prairie state ( train ) | prairie state ] ]''. amtrak would repeat this experiment with the detroit and milwaukee corridors. track conditions limited the new trainsets to { { convert | 79 | mph | km / h | | abbr = on } }, but they were clean, comfortable, quiet and reliable. in the first year the chicago – st. louis running time dropped from 5. 5 to 5 hours. the [ [ federal railroad administration ] ] refused a request from amtrak to raise the speed limit to { { convert | 90 | mph | km / h | | abbr = on } }, citing inadequate signalling along the route. the new equipment had fallen out of favor by the end of 1974 : food service was inadequate, and the five - car fixed consist could not handle demand. [ [ amfleet ] ] coaches and new conventional diesels replaced both of the turboliner trainsets in 1975. < ref > { { harvnb | sanders | 2006 | pp = 227 – 229 } } < / ref > < eod > < sod > the two daily round - trips were branded'' turboliner'', replacing the individual names'' [ [ abraham lincoln ( train ) | abraham lincoln ] ]'' and'' [ [ prairie state ( train ) | prairie state ] ]''. amtrak would repeat this this experiment with the detroit and milwaukee corridors. track conditions limited the new trainsets to { { convert | 79 | mph | km / h | | abbr = on } }, but they were clean, comfortable, quiet and reliable. in the first year the chicago – st. louis running time dropped from 5. 5 to 5 hours. the [ [ federal railroad administration ] ] refused a request from amtrak to raise the speed limit to { { convert | 90 | mph | km / h | | abbr = on } }, citing inadequate signalling along the route. the new trains had fallen out of favor by the end of 1974 : food service was inadequate, and the five - car fixed consist could not handle demand. [ [ amfleet ] ] coaches and new conventional diesels replaced both of the turboliner trainsets in 1975. < ref > { { harvnb | sanders | 2006 | pp = 227 – 229 } } < / ref > < eod >"]