What are the names of the two devices below?
1.this is a kind of joint bar with a bending in the middle.
2.this is a kind of emergence rail device that connects two parts of a rail when a complete rail cracked into two parts.This device can be installed at the place of crack in order to ensure safety when train passed.
1.this is a kind of joint bar with a bending in the middle.
2.this is a kind of emergence rail device that connects two parts of a rail when a complete rail cracked into two parts.This device can be installed at the place of crack in order to ensure safety when train passed.