Solutions/points:
Bus 1: Lancia Omicron - 1927; body bay Macchi (?) - 2 points to pguillem
Bus 2: Loewy Associates design for Greyhound Coach 1941 - 1 point to Amsterdam
Bus 3: Montreal Gas-Electric Coach - 1 point to Wendax
Bus 4: Yellow Coach Z-BH-602 1931 - 1 point for Amsterdam
Bus 5: Opel Blitz tractor pulling Fahrzeug Schumann bus body - 1938. 2 points to Hondast
Bus 6: Fiat 413 Monotral body by Viberti - 1961. 2 points to pguillem
Bus 7: 1950 Austin K8 bodied by Churchill - 1 point to billtorrance (make) and 1 to woodinsight (body).
Bus 8: Berliet PNMRE - 1968; body by Berliet 1 point each to pguillem and Wendax
Bus 9: Mumbai Ashok-Leyland body by Antony Motors. 1 pt each for pguillem and Wendax
Bus 10: Mercedes-Benz 0305 bodied by BUSAF - 2 points to Wendax
Bus 11: Büssing DF for Berlin, body by Gaubschat. 1 pt each for pguillem and Wendax
Bus 12: Drive Movie Bus - Paramount Studios 1935 - 1 point to Wendax
Bus 13: Mitsubishi Fuso Meteor Aero Queen III - 1 point to Wendax
Bus 14: Yellow Coach Model 722 - 1935. 1 point to Amsterdam
Bus 15: Sunbeam MF2B Coronation Class Trolleybus bodied by Charles H. Roe 1953 - 2 pts to Wendax
Bus 16: Viberti plastic bus concept - 1 point to pguillem
Bus 17: Mercedes-Benz O 10000 Reichspost built by M-B Gaggenau 1937 - 2 points to Tom_I
Bus 18: Henschel HS140N 1953 body by Trutz - 2 points to Wendax
Bus 19: "Cyclops" nuclear-powered bus from 1976 film "The Big Bus" - 1 pt to Hondast.
Bus 20: Lancia 120003 bodied by Dalfa - 1967 - 2 points to Wendax
Bus 21: Sentinel Landmaster V 1955 with Bellhouse Hartwell body - 2 points to Wendax
Bus 22: AEC Regal IV 1953 with Gurney Nutting body - 2 points to pguillem
Bus 23: Renault Galion with Amiot body 1957 - 2 points to pguillem
Bus 24: Leyland Arcadian from 1956 bodied by Metro-Cammell-Weymann - 2 points to woodinsight for maker, name, date and bodybuilder.
Bus 25: Henschel HS200 UN for Continental Trailways with Kässbohrer body - 1956. 1 pt each to pguillem and Wendax.
Bus 26: Stockholm Leyland Atlantean 1967 bodied by Park Royal - 2 points to Wendax
Bus 27: Yellow Coach 735 with GM engine 1938 - 1 point each to Amsterdam and Wendax
Bus 28: Büssing Senator 25DD 1965 for Stockholm, bodied by Büssing - 1 pt each for pguillem and Wendax
Bus 29: Twin-Coach - 1 point for pguillem; model is a 1938 58GDE Diesel-Electric coach - 1 point to Wendax
Bus 30: 1933 AEC Regal chassis with mobile home bodywork by Thos Harrington - 2 points to woodinsight
Bus 31: Büssing Aero bodied by Ludewig 1955 - 2 points for Wendax
Bus 32: Mauri 6.3 on Fiat 416 chassis 1966 - 2 points for Wendax
Bus 33: Ashok Leyland Comet pulling a 1950's body by Hyderabad Allwyn Metal Works - 2 points to Wendax
Bus 34: Jiangsu Flxible CJ6100SLC3HK - 1 point for Wendax
Bus 35: AEC Regent III 1954 in Lisbon , bodied by Weymann - 2 points to Wendax
Bus 36: Turin Fiat bodied by Aerfer - 2 points to pguillem
Points tally so far:
Wendax: 31
pguillem: 17
Amsterdam: 4
Hondast: 3
Tom_I: 2
woodinsight: 5
billtorrance: 1