bursting through at a connection

Zahraa Samy

Senior Member
Hi, would you please help me with understanding the underlined phrase form The Scarlet Plague by Jack London?

"In one place, a ten–inch tree, bursting through at a connection, had lifted the end of a rail clearly into view. The tie had evidently followed the rail, held to it by the spike long enough for its bed to be filled with gravel and rotten leaves, so that now the crumbling, rotten timber thrust itself up at a curious slant."
  • Uncle Jack

    Senior Member
    British English
    Bursting through the ground. "A connection" appears to be where two rails are joined, and the tree growing in that place appears to have broken the joint, so the end of one of the rails has been lifted up.
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