scl_speed->set_digits(0);
scl_speed->set_range(0, 200);
scl_speed->set_increments(5, 5);
scl_speed->set_size_request(210, -1);
scl_speed->signal_value_changed().connect(sigc::mem_fun(this, &TrainPanel::ui_speed_changed));
scl_speed->set_digits(0);
scl_speed->set_range(0, 200);
scl_speed->set_increments(5, 5);
scl_speed->set_size_request(210, -1);
scl_speed->signal_value_changed().connect(sigc::mem_fun(this, &TrainPanel::ui_speed_changed));