A is for (whoever gets Z starts the next theme)

[twyngwyn]

Grows on a tree

A is for Almond

[twyngwyn]

L is for Limousine 

[nicnacs_4u]

M is for motor car

[countessalmirena]

N is for nuclear submarine

[twyngwyn]

O is for Omnibus

[countessalmirena]

P is for palfrey

[twyngwyn]

Q is for QANTAS

[countessalmirena]

R is for rocket.

[twyngwyn]

S is for Steamship

[countessalmirena]

T is for TARDIS

[twyngwyn]

U is for Unicycle