N0016426RGW20-PROCUREMENT OF DESIGN AND PRODUCTION OF FLAT RAILCARS-PSC 2220- NAICS 336510

Amendment 0001: The purpose of this amendment is to extend the closing date and time from 2:00 PM on 20 February 2026 to 2:00 PM on 6 March 2026.

Amendment 0002: The purpose of this amendment is to

1. Extend the proposal due date until 13 March 2026 at 2pm (Eastern Standard Time).

2. Provide Answers to submitted questions in Section B.

3. Replace the original GFI Attachment with an updated attachment that now includes Drawing #WS20972A in Section J.

4. Add Drawing WS20972A to attacments in Section J.

5. Add Government Furnished Property list to Section J.

Amendment 0003: The purpose of this amendment is to

1. Provide answers to questions #28 through #32.

Amendment 0004: The purpose of this amendment is to

1. Extend the proposal due date until 27 March 2026 at 2pm (Eastern Standard Time).

2. Provide Answers to submitted questions #33 through #35.

3. Add FAR Clause 52.219-4 that was inadvertently omitted.

In addition, access to Amendments 0002 and 0003 have been changed from "Public" to "Secure."

Amendment 0005: The purpose of this amendment is to

• Revise requirement documents.

• Provide updated answers to previously posed questions.

• Extend the closing date for proposal receipt from 28 March 2026 to 18 May 2026.

• Add a Summary of Changes to Requirement.

Amendment 0006: The purpose of this amendment is to

• Provide answers to questions #36 through #37.

Amendment 0007: The purpose of this amendment is to

• This amendment is to change the scope of work by updating the Statement of Work and reducing the number of Contract Data Requirement Lists (CDRLs). Closing date extended to November 25, 2026, at 2:00pm (EST).