Exhibit 99 Additional Information

     Valhi,  Inc.  ("Valhi") and NL Industries,  Inc.  ("NL") are the holders of
59.0% and 35.8%,  respectively,  of the outstanding  shares of common stock, par
value $0.01 per share ("Common Stock"), of the issuer.

     Valhi and TIMET Finance  Management Company ("TFMC") are the direct holders
of approximately 83.1% and 0.5%,  respectively,  of the outstanding common stock
of NL. Valhi Holding Company ("VHC"),  the Harold Simmons Foundation,  Inc. (the
"Foundation"),  the Contran Deferred  Compensation Trust No. 2 (the "CDCT No.2")
and The Combined Master  Retirement Trust (the "CMRT") are the direct holders of
91.6%,  0.9%, 0.4% and 0.1%,  respectively,  of the common stock of Valhi. Valhi
Group,  Inc.  ("VGI"),  National  City  Lines,  Inc.  ("National"),  and Contran
Corporation ("Contran") are the direct holders of approximately 87.4%, 10.3% and
2.3%, respectively,  of the outstanding common stock of VHC. National, NOA, Inc.
("NOA") and Dixie Holding  Company  ("Dixie  Holding") are the direct holders of
approximately  73.3%, 11.4% and 15.3%,  respectively,  of the outstanding common
stock of VGI. Contran and NOA are the direct holders of approximately  85.7% and
14.3%,  respectively,  of the outstanding common stock of National.  Contran and
Southwest Louisiana Land Company,  Inc.  ("Southwest") are the direct holders of
approximately 49.9% and 50.1%, respectively,  of the outstanding common stock of
NOA.  Dixie Rice  Agricultural  Corporation,  Inc.  ("Dixie Rice") is the direct
holder of 100% of the outstanding common stock of Dixie Holding.  Contran is the
holder of 100% of the outstanding  common stock of Dixie Rice and  approximately
88.9% of the outstanding common stock of Southwest.

     Substantially all of Contran's  outstanding  voting stock is held by trusts
established for the benefit of certain  children and  grandchildren of Harold C.
Simmons (the "Trusts"),  of which Mr. Simmons is the sole trustee, or is held by
Mr. Simmons or persons or entities  related to Mr.  Simmons.  As sole trustee of
the Trusts,  Mr. Simmons has the power to vote and direct the disposition of the
shares of Contran stock held by the Trusts.  Mr.  Simmons  disclaims  beneficial
ownership of all Contran shares that the Trusts hold.

     Harold C. Simmons is the chairman of the board and chief executive  officer
of each of the  issuer  and NL and the  chairman  of the board of each of Valhi,
VHC, VGI, National, NOA, Dixie Holding, Dixie Rice, Southwest and Contran.

     The Foundation  directly holds approximately 0.9% of the outstanding shares
of Valhi common stock. The Foundation is a tax-exempt  foundation  organized for
charitable  purposes.  Harold C.  Simmons  is the  chairman  of the board of the
Foundation.

     The CDCT No. 2 directly holds  approximately 0.4% of the outstanding shares
of Valhi common stock. U.S. Bank National  Association  serves as the trustee of
the CDCT No. 2.  Contran  established  the CDCT No. 2 as an  irrevocable  "rabbi
trust" to assist Contran in meeting certain  deferred  compensation  obligations
that it owes to Harold C. Simmons.  If the CDCT No. 2 assets are insufficient to
satisfy  such  obligations,  Contran is obligated to satisfy the balance of such
obligations  as they come due.  Pursuant to the terms of the CDCT No. 2, Contran
(i) retains the power to vote the shares of Valhi common stock held  directly by
the CDCT No. 2, (ii) retains dispositive power over such shares and (iii) may be
deemed the indirect beneficial owner of such shares.

     The CMRT directly holds  approximately  0.1% of the  outstanding  shares of
Valhi common stock.  Contran  sponsors the CMRT,  which  permits the  collective
investment by master trusts that maintain the assets of certain employee benefit
plans Contran and related companies adopt. Harold C. Simmons is the sole trustee
of the  CMRT  and a member  of the  trust  investment  committee  for the  CMRT.
Contran's  board of  directors  selects  the  trustee  and  members of the trust
investment  committee for the CMRT.  Mr. Simmons is a participant in one or more
of the employee benefit plans that invest through the CMRT.

     By virtue of the  holding  of the  offices,  the  stock  ownership  and his
services as trustee, all as described above, (a) Harold C. Simmons may be deemed
to control such entities and (b) Mr. Simmons and certain of such entities may be
deemed to possess  indirect  beneficial  ownership  of shares  directly  held by
certain of such other entities.  However,  Mr. Simmons disclaims such beneficial
ownership of the shares beneficially owned directly or indirectly by any of such
entities,  except to the extent of his vested  beneficial  interest,  if any, in
shares held by the CMRT and his interest as a beneficiary of the CDCT No. 2. Mr.
Harold Simmons disclaims beneficial ownership of all shares of Common Stock that
Valhi, NL or TFMC directly holds.

     TFMC owns  5,203  shares  of  Common  Stock.  Titanium  Metals  Corporation
("TIMET")  owns  100% of the  outstanding  common  stock  of TFMC.  Tremont  LLC
("Tremont"),  Harold C. Simmons'  spouse,  the CMRT, Valhi and Harold C. Simmons
are  the  holders  of  approximately   33.5%,   12.7%,  10.2%,  3.8%  and  2.6%,
respectively,  of the  outstanding  common  stock of TIMET.  Valhi is the direct
holder of 100% of the  membership  interests  of Tremont.  The  ownership of Ms.
Simmons  includes  10,666,666  shares of TIMET's  common  stock that she has the
right to acquire upon conversion of 1,600,000  shares of TIMET's 6 3/4% Series A
Convertible Preferred Stock, par value $0.01 per share (the "Series A Preferrred
Stock"), that she holds directly.  The ownership of Valhi includes 98,000 shares
of TIMET's  common stock that Valhi has the right to acquire upon  conversion of
14,700  shares of Series A  Preferred  Stock  that  Valhi  directly  holds.  The
percentage  ownership  of TIMET's  common  stock held by Ms.  Simmons  and Valhi
assumes the full conversion of only the shares of Series A Preferred Stock owned
by her or Valhi,  respectively.  Harold C.  Simmons is  chairman of the board of
TIMET and Tremont.

     Harold C.  Simmons'  spouse is the direct owner of 36,356  shares of Common
Stock,  119,475 shares of NL common stock,  43,400 shares of Valhi common stock,
228,000 shares of TIMET common stock and 1,600,000  shares of Series A Preferred
Stock,  which are convertible into 10,666,666  shares of TIMET common stock. Mr.
Simmons may be deemed to share indirect beneficial ownership of such shares. Mr.
Simmons disclaims all such beneficial ownership.

     Harold C.  Simmons  directly  holds 4,755 shares of Common  Stock,  257,000
shares  of NL  common  stock  (including  stock  options  exercisable  for 4,000
shares), 3,383 shares of Valhi common stock and 1,933,700 shares of TIMET common
stock.

     A trust,  of which  Harold C.  Simmons and his spouse are  trustees and the
beneficiaries  are the  grandchildren  of his  spouse,  is the direct  holder of
36,500 shares of Valhi common stock.  Mr. Simmons,  as co-trustee of this trust,
has the power to vote and direct the  disposition  of the shares of Valhi common
stock the trust holds. Mr. Simmons disclaims  beneficial ownership of any shares
of Valhi common stock that this trust holds.

     NL and a subsidiary of NL directly own  3,522,967  and 1,186,200  shares of
Valhi common stock,  respectively.  Pursuant to Delaware  law,  Valhi treats the
shares of Valhi  common stock that NL and the  subsidiary  of NL own as treasury
stock for voting  purposes.  For the  purposes  of the  percentage  calculations
herein, such shares are not deemed outstanding.