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cast base, 1820.
Birkenshaw, of Bedlington, Durham, invented the rolled rail; the iron, while hot, being passed between grooved rollers of the required pattern (i j k l).
m n o p are respectively the Spanish, Marseilles, Strasburg, and Great Western (England) patterns.
q, Durham and Sunderland, England.
r, Berlin and Potsdam, Prussia.
s, London and Blackwall, England.
t, Manchester and Birmingham, England.
u, Saint-Etienne to Lyon, France.
v, Wilmington and Susquehanna, United States.
w, Great Western (Old), England.
x, London and Croydon, England, which first dispensed
Railway-rails. with longitudinal sleepers and chairs.
y, Morris and Prevost, England.
z, Birmingham and Gloucester, England.
a′, London and Birmingham, England.
b′, London and Brighton, England.
c′, Midland counties, England.
d′, contractor's rail.
e′, street-car rail.
f′, locomotive street-rail.
g′, continuous rail.
h′, tubular rail.