wall 56 the secondary strut 80 further includes a hook member 86 extending from an end 88 thereof that is adapted to lock into the bulbous hook 63 of the grab bar 61 as shown in fig3 the secondary strut 80 includes two upwardly extending triangular protrusions 90 a 90 b that are adapted to interact with the modular seats 58 as described in more detail hereinbelow the secondary strut 80 may further include a strut cap 92 that locks into the secondary strut 80 at a second end 94 to provide aesthetic benefits as well as having the capability to accept implements as described in more detail below although the track system 54 including the grab bar 61 and the channel 64 are depicted as integral with the wall 56 of the transit car 52 any of the track system 54 components may be installed as separate parts that are attached to an outside surface of the wall 56 further latches 77 83 may be utilized to secure the struts 70 80 to the track system 54 and or other locking mechanisms may be used as known in the art such as for example lock and key it is preferable that the latches 77 83 are positioned such the seat 58 covers the latches 77 83 when the seat 58 is attached to the struts 70 80 the hidden latches 77 83 prevent unauthorized persons from accessing and unlocking the struts 70 80 a modular seat 200 as best seen in fig3 may be used with the track system 54 disclosed previously herein or may be used with other track systems as known in the art the modular seat 200 includes a first generally vertical seat portion 201 a second.