Post-effective Amendment (investment Company, Rule 485(b)) (485bpos)

As filed with the U.S. Securities and Exchange Commission on February 8, 2013

File No. 333-170422

811-22492

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		[X]
Pre-Effective Amendment No.		[ ]
Post-Effective Amendment No.	5	[X]

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		[X]

Amendment No.	8	[X]

(Check appropriate box or boxes)

MainGate Trust

(Exact name of Registrant as Specified in Charter)

6075 Poplar Ave.

Memphis, TN 38119

(Address of Principal Executive Offices)

(Registrant's Telephone Number, including Area Code) - (901) 537-1866

Geoffrey P. Mavar

MainGate Trust

6075 Poplar Ave.

Memphis, TN 38119

(Name and address of agent for Service)

With copies to:

Dee Anne Sjögren

Thompson Coburn LLP

One US Bank Plaza

St. Louis, Missouri 63101

(314) 552-6295

It is proposed that this filing will become effective (check appropriate box)

[X]	Immediately upon filing pursuant to Rule 485(b).
[ ]	on (date) pursuant to Rule 485(b).
[ ]	on (date) pursuant to Rule 485(a)(1).
[ ]	60 days after filing pursuant to Rule 485 (a)(1).
[ ]	75 days after filing pursuant to Rule 485 (a)(2).
[ ]	on (date) pursuant to Rule 485(a)(2).

If appropriate, check the following box:

[ ]	This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This Post-Effective Amendment (“PEA”) No. 5 to the Registration Statement of MainGate Trust (the “Trust”) on Form N-1A hereby incorporates Parts A, B and C from the Company’s PEA No. 4 on Form N-1A filed January 28, 2013. This PEA No. 5 is filed for the sole purpose of submitting the XBRL exhibit for the risk/return summary first provided in PEA No. 4 to the Trust’s Registration Statement.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Post-Effective Amendment No. 5 to its Registration Statement under Rule 485(b) under the Securities Act of 1933, and has duly caused this Post-Effective Amendment No. 5 to its Registration Statement to be signed below on its behalf by the undersigned, thereunto duly authorized, in the City of Memphis and State of Tennessee on the 8th day of February, 2013.

	MainGate Trust

	By: /s/ Matthew G. Mead
	Matthew G. Mead
	President

Pursuant to the requirements of the Securities Act, this registration statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature	Title	Date

/s/ Matthew G. Mead	Trustee and President	February 8, 2013
Matthew G. Mead

/s/ Geoffrey P. Mavar	Trustee and Chief Financial Officer	February 8, 2013
Geoffrey P. Mavar

/s/ Robert A. Reed* Robert A. Reed	Trustee	February 8, 2013

/s/ Darrison N. Wharton* Darrison N. Wharton	Trustee	February 8, 2013

/s/ David C. Burns* David C. Burns	Trustee	February 8, 2013

/s/ Marshall K.Gramm* Marshall K.Gramm	Trustee	February 8, 2013

/s/ Barry Samuels* Barry Samuels	Trustee	February 8, 2013

/s/ Moss W. Davis* Moss W. Davis	Trustee	February 8, 2013

By: /s/ Geoffrey P. Mavar

Attorney-in-fact

*Geoffrey P. Mavar signs this document on behalf of each of the foregoing persons pursuant to the Powers of Attorney.

EXHIBIT INDEX

Exhibit	Exhibit No.
Instance Document	EX-101.INS
Schema Document	EX-101.SCH
Calculation Linkbase Document	EX-101.CAL
Definition Linkbase Document	EX-101.DEF
Label Linkbase Document	EX-101.LAB
Presentation Linkbase Document	EX-101.PRE