Split and fill
the sponge cake with butter icing. Cut off a
10cm/4in strip from one side of the cake. Use the
off-cut to make a 15 x 7.5cm/6 x 3in rectangle, and
stick on the top.
Shape the
sloping top and cut a 2.5cm/1in piece from both
ends between the tracks. Shape the rounded ends
for the wheels and tracks. Place on the cake
board and brush with apricot jam. Cover with a
layer of marzipan.
Tint a quarter of
the sugar-paste icing brown and the rest green. Roll
out the green to a 25cm/10in square. Break small
pieces of brown icing and place all over the green.
Flatten and roll out together to give a camouflage
effect. Turn the icing over and repeat.
Continue to roll
out until the icing is 3mm thick. Lay it over the
cake and gently press to fit. Cut away the excess.
Cut a piece into a 6cm disc and stick on the top
with a little water. Cut a small hole in it for the
gun and insert the chocolate flake. Stick liquorices
on for the tracks, using a little black royal icing.
Stick on biscuits for the wheels and sweets for the
lights and portholes.