Thank you very much for the great photo. Monon freight car photos are rare from this era. BTW what I have on this series:
26000-26999, built 1913 by ACF, 40 ft, 50ton, drop bottom. A similar series (25000-25999) was built a year earlier. All seem to have been retired in the '30s. High sulphur Indiana coal was unkind, no doubt.