PO wants to improve their services so they brought in new and faster technology but Postal Workers do not like it because it is too fast and hard to use and they are worried that technology will replace them with their jobs in the future.
Also, the letter carriers only carried one bag with mail in it. Now PO is asking them to carry two bags- it is heavy for them, hurts their arms and hard for them to see the ground when they walk up the stairs. The Postal Workers feel this way is slow too.
Thanks for the link!