1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G
                   Under the Securities Exchange Act of 1934
                                 Amendment 1

                             Harmon Industries, Inc.
- -------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- -------------------------------------------------------------------------------
                        (Title of Class of Securities)

                                   413136102
- -------------------------------------------------------------------------------
                                 CUSIP Number

      Check the following box if a fee is
      being paid with this statement.                           / /

===============================================================================

CUSIP NO.   413136102
          -------------------

- -------------------------------------------------------------------------------
1)  Names of Reporting Persons                 Mercantile Bancorporation Inc.
    S.S. or I.R.S. Identifica-
    tion Nos. of above Persons                           43-0951744
- -------------------------------------------------------------------------------
                                                            (a)
2)  Check the appropriate Box if a member of a group
                                                            (b)
- -------------------------------------------------------------------------------

3)  SEC Use Only

- -------------------------------------------------------------------------------

4)  Citizenship or Place of Organization                            Missouri

- -------------------------------------------------------------------------------

                  (5) Sole Voting Power                              512,240

 Number Of        -------------------------------------------------------------
  Shares
Beneficially      (6) Shared Voting Power                                  0
 Owned by
   Each           -------------------------------------------------------------
 Reporting
  Person          (7) Sole Dispositive Power                               0
   With
   Each           -------------------------------------------------------------

                  (8) Shared Dispositive Power                       512,240

- -------------------------------------------------------------------------------

9)  Aggregate Amount Beneficially Owned by Each Reporting Person     512,240

- -------------------------------------------------------------------------------

10) Check if the Aggregate Amount in Row (9) Excludes
    Certain Shares

- -------------------------------------------------------------------------------

11) Percent of Class Represented by Amount in Row 9                      7.4%

- -------------------------------------------------------------------------------

12) Type of Reporting Person                                            H.C.

- -------------------------------------------------------------------------------



 2

Item 1(a)   Name of Issuer:
                  Harmon Industries, Inc.


Item 1(b)   Address of Issuer's Principal Executive Offices:
                  1300 Jefferson Court
                  Blue Springs, MO 64015


Item 2(a)   Name of Person Filing:

                  Mercantile Bancorporation Inc.

Item 2(b)   Address of Principal Business Offices or, if none, Residence:
                  #1 Mercantile Center
                  St. Louis, Missouri 63101


Item 2(c)   Citizenship
                  Missouri


Item 2(d)   Title of Class of Securities:
                  Harmon Industries, Common Stock, Par Value $.25


Item 2(e)   CUSIP Number:
                  413136102


Item 3.     If this Statement is filed pursuant to Rules 13d-1(b) or
             13d-2(b), check whether the person filing is a:

            (a) { }  Broker or Dealer registered under Section 15 of the Act

            (b) { }  Bank as defined in section 3(a)(6) of the Act
            (c) { }  Insurance Company as defined in section 3(a) (19)
                       of the Act
            (d) { }  Investment Company registered under section 8 of
                       the Investment Company Act
            (e) { }  Investment Adviser registered under section 203 of
                       the Investment Advisers Act of 1940
            (f) { }  Employee Benefit Plan, Pension Fund which is
                       subject to the provisions of the Employee
                       Retirement Income Security Act of 1974 or
                       Endowment Fund; see Sec. 240.13d-1(b)(1)(ii)(F)
            (g) {x}  Parent Holding Company, in accordance with
                       Sec. 240.13d-1(b)(ii)(G)
            (h) { }  Group, in accordance with Sec. 240.13d-1(b)(1)(ii)(H)



 3

                                                                                 
Item 4.     Ownership.

        (a) Amount Beneficially Owned:
                                            512,240


        (b) Percent of Class:
                                               7.4%


        (c) Number of shares as to which such person has:

          (i)  sole power to vote or to direct the vote                             512,240
         (ii)  shared power to vote or to direct the vote                                 0
        (iii)  sole power to dispose or to direct the disposition of                      0
         (iv)  shared power to dispose or to direct the
               disposition of                                                       512,240



Item 5.     Ownership of Five Percent or Less of a Class.

        Not Applicable

Item 6.     Ownership of More than Five Percent on Behalf of Another
             Person.

        Not Applicable

Item 7.     Identification and Classification of the Subsidiary Which
             Acquired the Security Being Reported on By the Parent Holding
             Company.

        See Exhibit A

Item 8.     Identification and Classification of Members of the Group.

        Not Applicable

Item 9.     Notice of Dissolution of Group.

        Not Applicable



 4

Item 10.    Certification.

        By signing below I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired in the ordinary
course of business and were not acquired for the purpose of and do not
have the effect of changing or influencing the control of the issuer of
such securities and were not acquired in connection with or as a
participant in any transaction having such purposes or effect.

After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth on this statement is true,
complete and correct.




- --------------------------------
Date

Mercantile Bancorporation Inc.





BY
- --------------------------------
  Signature





Janie Greenwood Harris
- --------------------------------
Name/Title




 5

                                    EXHIBIT A




Item 7.     Identification of Relevant Subsidiaries


            Name                                Item 3 Classification
=============================================================================

       Mercantile Bank                                  Bank



 6