CREATE TABLE table_45436 ("Concessionaire" TEXT, "FA Division ( s ) " TEXT, "Gauge" TEXT, "Length ,  km" FLOAT, "Takeover Date" TEXT)

What was the guage of the concessionaire ferrosur roca?
SELECT "Gauge" FROM table_45436 WHERE "Concessionaire" = 'ferrosur roca'
SELECT "Gauge" FROM "table_45436" WHERE "Concessionaire" = 'ferrosur roca'