They are shorter than the Bachmann On30 coaches so would be ideal behind one of Bachmann's smaller On30 locomotives.
Bachmann USA Open-Sided Excursion Car with Seats Durango & Silverton (Red) HO
Bachmann (ON30) Narrow Gauge Express Set.
25127 Bachmann ON30 Scale Closed Street Car Christmas (Lighted)
NEW SEALED Bachmann ON30 29401 Three Rivers Steel 0-6-0 Steam Locomotive