A

• Accidents and incidents involving New York, New Haven and Hartford Railroad (1 P)
• Companies affiliated with the New York, New Haven and Hartford Railroad (2 C, 16 P)

B

• New York, New Haven and Hartford Railroad bridges (16 P)

F

• Former New York, New Haven and Hartford Railroad stations (4 C, 112 P)

L

• New York, New Haven and Hartford Railroad lines (4 C, 13 P)

N

• New York, New Haven and Hartford Railroad locomotives (9 P)

P

• Passenger trains of the New York, New Haven and Hartford Railroad (19 P)
• Predecessors of the New York, New Haven and Hartford Railroad (3 C, 80 P)

• New York, New Haven and Hartford Railroad

A

• Alphabet Route

C

• Cedar Hill Yard
• Connecticut Valley Railroad Roundhouse and Turntable Site
• Cos Cob Power Station

D

• Frederic C. Dumaine Jr.

E

• Electrification of the New York, New Haven and Hartford Railroad
• Howard Elliott (railroad executive)

H

• John Manning Hall
• Hancock air whistle
• Harlem River Yards
• Hartford Yard
• James Humphrey Hustis Sr.

M

• Maybrook Yard
• Edwin Harrison McHenry
• Midway Yard (Connecticut)

N

• Template:NH Berkshire
• Northup Avenue Yard
• Template:Nutmeg

O

• Oak Point Yard

P

• Port Morris Ferry Bridges

S

• SoNo Switch Tower